Sapling
Sapling is a language model toolkit and writing assistant that combines grammar checking, AI content detection, autocomplete, rephrasing and sentiment analysis. It reaches developers through an API, SDKs and an MCP server, and customer-facing teams through browser extensions.
What is Sapling?
Sapling is a language model toolkit published by Sapling Intelligence, Inc. It has two faces: a developer platform made of an API and SDKs, and a writing assistant that layers itself onto the tools a team already uses. On the developer side, the REST API exposes endpoints for edits (grammar and spelling), spell checking, autocomplete, rephrasing, tone, sentiment, similar terms, semantic search, AI detection and quality scoring. Python and JavaScript SDKs wrap those endpoints and add ready-made UI components, with React and Angular samples published on GitHub. An official MCP server, shipped as an npm package and run locally over stdio on Node.js 18 or later, exposes seven tools (grammar check, spell check, AI detection, rephrase, summarise, sentiment and language detection) to assistants such as Claude Desktop, Claude Code, Cursor, Windsurf, Zed and Cline. On the assistant side, a browser extension covers Chrome, Firefox, Edge, Opera and Brave, alongside add-ins for Google Docs and Google Workspace and for Microsoft Word and Outlook through AppSource. The Chrome listing reports around 60,000 users and a 4.4 out of 5 rating across 129 reviews. The home page groups the offer into six products: API and SDK, MCP Server, Grammar and Quality, AI Detection, Autocomplete and Snippets. Sapling Suggest adds recommended chat replies pulled from a team knowledge base, built on an announced partnership with OpenAI. The detector is presented as able to separate human writing from text produced by GPT-5, Claude 4.5, Gemini 2.5, Qwen3 and DeepSeek-V3. Language coverage is deliberately uneven: twelve languages get grammar and spelling, twenty-nine more get spelling only. Sapling puts unusual weight on security and deployment for a company of its size. It advertises SOC 2 Type II, GDPR compliance, HIPAA support with a signed BAA, PCI support and annual penetration testing, together with TLS in transit, AES-256 at rest, PII redaction, SSO, SCIM, MFA, role-based access control and audit logs. Beyond its AWS cloud it offers cloud-premises deployment on AWS, Azure or GCP and on-premises Docker containers. The documentation insists the system is designed to not hallucinate and to return structured outputs that production systems can rely on. The team comes out of the Berkeley and Stanford AI labs and the product is backed by Y Combinator.
What it does
- Check grammar, spelling and punctuation, catching 60% more language quality issues than other checkers according to its home page
- Detect whether a text was written by a human or generated by AI, with an overall score and sentence-by-sentence predictions
- Autocomplete sentences and whole messages inside messaging and support platforms
- Rephrase and paraphrase text, adjusting tone, formality, length and sentence structure
- Suggest chat replies drawn from the team's own knowledge base with Sapling Suggest
- Analyse sentiment and tone, run semantic search and surface similar terms for tagging
- Summarise a document and detect its language across more than thirty languages
When to use Sapling / When not to
A quick filter to help you decide if Sapling is the right fit.
When to use Sapling
- Support and contact centre agents who want suggested replies, shared snippets and autocomplete inside Zendesk, Intercom, ServiceNow or Freshdesk
- Developers embedding grammar, autocomplete, rephrasing or AI detection into their own product through a REST API and Python or JavaScript SDKs
- Inside sales and revenue teams writing outreach in Salesforce, Outreach, Salesloft, Apollo or Mixmax
- Regulated organisations in healthcare, finance, insurance and government that need SOC 2 Type II, a signed HIPAA BAA and a self-hosted deployment option
- Teachers, editors and reviewers who need to check whether a piece of writing was produced by a generative model
When not to use Sapling
- Anyone who needs a mobile app: Sapling publishes no iOS or Android application, only browser extensions and Office and Google add-ins
- Users looking for a translator: Sapling detects languages and corrects them, but it does not translate text from one language into another
- Writers who want long-form content generation: there is no article writer, no image generation and no video
- Teams working mainly outside the twelve fully supported grammar languages, since the twenty-nine other languages get spell checking only
- Organisations that require open-source software, which Sapling explicitly states it is not on its own on-premises comparison page
How to use Sapling
A typical end-to-end flow, from setup to results.
- Pick your entry point: the browser extension for a no-code start, the API and SDKs for a product integration, or the MCP server for an AI assistant
- No-code route: install the extension from the Chrome Web Store, or from the Firefox, Edge, Opera or Brave listings
- Create an account and confirm your email address; the one-month Sapling Pro free trial starts automatically, with no credit card
- Let the extension attach to text areas and rich-text fields, and switch on short input fields if you want them covered too
- Set its scope in Site Controls in the dashboard, allowing or blocking hostnames one by one so it only runs where you want it
- Configure your dialect (American or British), a custom dictionary imported from CSV, plus error mappings and filters
- Create shared snippets and text-expansion macros for the phrases your team repeats
- Developer route: generate an API key from the docs, which opens a one-month API free trial with a character cap, then POST to the edits endpoint or call the Python or JavaScript SDK
- Subscribe from the API checkout to lift the trial quotas and move to metered billing, and use the Postman collection or Zapier connection if you prefer no code
- AI assistant route: register the MCP server in one command, for example claude mcp add sapling with your API key and npx; for teams, start on the teams page or request an Enterprise quote from ten seats up
Pros & Cons
Pros
- One vendor covers grammar, autocomplete, AI detection, rephrasing, sentiment and semantic search, instead of stitching several tools together
- Every integration route is open: REST API, SDKs, browser extension, Office and Google add-ins, and an MCP server for AI assistants
- Compliance depth that is rare at this size and price: SOC 2 Type II, stated GDPR compliance, a signed HIPAA BAA, PCI support, annual penetration testing and a named Article 27 EU representative
- Data residency options most competitors reserve for far larger contracts: cloud-premises on AWS, Azure or GCP, on-premises Docker, and a zero data retention option for PHI and ePHI
- Low cost of entry: a permanent free plan and a one-month Sapling Pro trial that does not ask for a credit card
- Broad language coverage, with spell checking across forty-one languages and full grammar support in twelve
- Explicitly anti-hallucination design, with structured outputs intended for real-time production use, backed by public documentation, a Postman collection, GitHub samples, a Discord community and a public status page
Cons
- No mobile app at all: no iOS or Android listing is published anywhere on the site
- No subprocessor list is published; the documentation simply invites you to contact the company for one
- No data processing agreement is published or offered; the BAA that does exist covers HIPAA, not GDPR
- The privacy policy details no GDPR rights (access, erasure, portability) and mentions neither standard contractual clauses nor a data protection officer
- A single generic mailbox serves as support, privacy and legal notice contact, and no postal address is published anywhere beyond the statement that Sapling is located in California
- The position on training models with customer data is left unstated: used only to improve the Service is ambiguous, and full grammar support stops at twelve languages
- Pricing transparency is partial: API rates live on a separate documentation page, Enterprise is quote-only from ten seats, the privacy policy carries no effective date and no company founding date is published anywhere on the site
Pricing & Plans
A permanent free plan is available at no cost. The lowest paid entry point is the Pro plan at USD 25.00 per month on monthly billing; the same plan costs USD 12 per month when committed annually, that is USD 144 per year. The Enterprise plan is quote-based, starts at ten seats and is listed at USD 15 per seat per month. API access is billed separately on a metered, pay-as-you-go basis with a one-time minimum of USD 5, invoiced monthly. All fees are stated in US dollars and are non-refundable. Payments are processed by Stripe by credit card, other methods being available on request. A one-month Sapling Pro free trial is granted at sign-up without a credit card.
- basic suggestions
- use on free domains
- AES-256 and TLS encryption
- up to 20 snippets
- advanced premium suggestions
- Autocomplete Everywhere
- Rephrase
- unlimited snippets
- unlimited use on premium domains
- email and ticket support
- AI detection on longer queries
- and chat assist with Sapling Suggest
- conversational insights
- domain administration
- team analytics
- a dedicated support contact
- bulk provisioning
- advanced security options
- self-hosting
- custom integrations
- sold separately from the user plans
- one month of Sapling Pro at sign-up
- no credit card required
Data, GDPR & hosting
A consolidated view of how Sapling handles your data.
GDPR overview
Sapling states on its security page that it is GDPR compliant and SOC 2 Type II certified, and it displays a GDPR badge next to SOC 2, HIPAA support, PCI support and annual penetration testing. The privacy policy names an Article 27 EU representative for EU and UK residents: George Barry, 4 St Christopher's Rd, Montenotte, Cork, T23 E9TR, Ireland. The same policy says the services are hosted in the United States and intended for US visitors, with transfers outside the EU made with the user's consent. Beyond that the implementation is thin: no standard contractual clauses, no named data protection officer, no published data processing agreement, no section listing GDPR rights such as access, rectification, erasure or portability, and no subprocessor list. Privacy requests go to a single generic address. Customers who cannot transfer data out of a region are offered cloud-premises or on-premises deployment instead.
Who owns the data?
You keep ownership of what you submit. The terms treat everything you send as User Content and make you solely responsible for it, but you also grant Sapling an irrevocable, non-exclusive, royalty-free, worldwide licence to reproduce, distribute, create derivative works of and sublicense it, solely to run and improve the Service and develop new products. Everything else in the Service belongs to Sapling, and any feedback you send is assigned to it as non-confidential. The privacy policy says customer data is neither sold nor rented, but allows sharing with affiliates, analytics partners such as Google Analytics, legal authorities and an acquirer in a merger. Sapling is not obliged to back up your content.
Reuse rights
Whatever the API returns to you (corrections, completions, rephrasings, suggested replies, scores) comes back as structured JSON and carries no published usage restriction, so you can put it to work in your own documents, tickets or product without asking permission. The limits sit on the service itself, not on its output. The terms forbid reselling, renting or sublicensing the Service, creating derivative works of it, reverse-engineering it, or accessing it in order to build a similar or competing product. Without a signed service agreement there is no commercial exploitation of the Service or of the content it displays. Scraping or mining the Service and generating automated queries are also prohibited, and the licence granted to you is limited, revocable, non-exclusive and non-transferable. US export control rules may apply.
Data retention & training
Hosting summary
The default backend runs on Amazon Web Services in the us-west region, and the privacy policy confirms that the services are hosted in the United States. The site's own IP resolves to a US Amazon address in Boardman, Oregon. Jurisdiction is therefore American: the terms place disputes in Santa Clara County, California. Processing happens on private networks configured to deny by default. Traffic is encrypted with TLS 1.2 and data at rest with AES-256. Before processing, Sapling strips numbers and numeric expressions such as phone numbers, along with email addresses and URLs. Customers with residency constraints are offered alternatives to the shared cloud: cloud-premises deployment in their own AWS, Azure or GCP account, or on-premises deployment through Docker containers. Payments are handled by Stripe, a PCI Level 1 Service Provider. No hosting region other than us-west is named for the standard cloud offering.
Things to keep in mind
Risks and trade-offs to weigh before adopting Sapling.
- The browser extension is active on every site by default, so sensitive text can leave for Sapling's servers without you meaning to send it; the Site Controls settings need configuring before real use
- Data goes to the United States by default, on AWS in the us-west region, which is a decision point for any European data controller before rollout
- The licence you grant over your content is very broad, covering service improvement and the development of new products and services, with no documented opt-out
- No subprocessor list is published, so the processing chain cannot be verified without going through support
- Over-reliance on suggestions dulls proofreading attention over time and flattens a whole team's writing into one voice
- AI content detection is fallible by nature: a score proves nothing, and using it as academic or disciplinary evidence is risky
- The minimum age is 13, so classroom use collects minors' writing; Sapling is not obliged to back up your content, mandatory arbitration with a class action waiver applies under Santa Clara County law, and liability is capped at the greater of USD 50 or twelve months of fees
Setup & Integrations
Technical difficulty
Easy for most people, and the difficulty scales with your route. The browser extension installs in one click from the Chrome Web Store and needs no technical skill. The API is advertised as an integration in a few lines: one HTTP POST with an API key, or a call through the Python or JavaScript SDK. The MCP server takes a single command, with Node.js 18 or later and npx required. Self-hosting is the demanding path, and Sapling states you will need some familiarity with containers and virtualisation. SSO, SCIM and bulk provisioning are Enterprise features, set up with assistance.
Deployment
Integrations
Supported languages
Behind Sapling
Fundraising
Social
Resources
All the official URLs gathered for verification and reference.
Alternatives
Tools that compete with or complement Sapling.
Frequently asked questions
Is there a free plan, and is there a free trial?
How much does the cheapest paid plan cost?
How is the API billed?
Are there an API and SDKs?
Can I use Sapling from an AI assistant?
Which languages are supported?
Is there a mobile app?
Which certifications does Sapling hold, and where is data hosted?
Can I avoid having my data stored?
What is the minimum age, and are discounts available?
Should you pick Sapling?
Sapling serves two audiences at once, and does it without splitting into two products. Developers get a REST API, Python and JavaScript SDKs and an MCP server; customer-facing teams get a browser extension, shared snippets and Sapling Suggest sitting inside the helpdesk, CRM or inbox they already work in. The same language engine drives both, covering grammar, autocomplete, AI detection, rephrasing, sentiment and semantic search. Its strongest card is the combination of compliance and deployment options. SOC 2 Type II, stated GDPR compliance, a signed HIPAA BAA, PCI support, annual penetration testing, a named Article 27 EU representative, and a choice between hosted cloud, cloud-premises on AWS, Azure or GCP, and on-premises Docker containers. That is a list you normally meet at a much higher price point. A permanent free plan and a one-month Pro trial without a credit card keep the cost of trying it near zero. The weak side is transparency about the company itself. No subprocessor list is published, no data processing agreement is offered, the privacy policy enumerates no GDPR rights, a single generic mailbox handles support, privacy and legal notices, no postal address appears anywhere, and no founding date is published. The stance on training models with customer data is left unstated rather than denied, which matters given how broad the content licence in the terms is. The product itself looks alive and maintained: a Gemma 4 fine-tune announced in the documentation in June 2026, a recent MCP server, a public status page, and a Chrome extension with roughly 60,000 users rated 4.4 out of 5 across 129 reviews. This is a small Y Combinator-backed team out of the Berkeley and Stanford AI labs, punching above its weight on engineering and below it on corporate disclosure.
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