You're checking a normal-length draft
An email, essay intro, or a few paragraphs generally clears Sapling's 2,000-character free cap. Penlify's free plan doesn't force you to split the draft into chunks to check it.
The short answer
Choose Sapling if you're a team that wants grammar checking, autocomplete, and AI detection under one subscription. Choose Penlify if you want to check and rewrite a real-length draft without hitting a character wall on the free plan.
You want a full writing-assistant suite
Grammar checking, autocomplete, and team seats come bundled with the detector — useful for an organization standardizing on one writing tool.
Feature and pricing comparison
Numbers below are read directly from Sapling's pricing page, not estimated.
| Area | Penlify | Sapling |
|---|---|---|
| Free plan detection limit | 3 detections/month, sentence-level scoring, no per-check character cap. | 2,000 characters per check (~300-400 words). |
| Free plan rewriting | 5 rewrites/month included free. | Not included — Rephrase is a Pro-only feature. |
| Paid detection limit | Unlimited, same sentence-level view. | Pro plan: up to 100,000 characters per check. |
| Cheapest plan with rewriting | $2.99/mo or $24.99/yr (~$2.08/mo). | Pro: $25/mo billed monthly, or $12/mo billed annually ($144/yr). |
| Fixing a flagged passage | Rewrite the flagged sentence directly in the same workspace. | Separate Rephrase tool, not a scoped flag-to-rewrite step. |
| Other bundled tools | None — detection and rewriting only. | Grammar checking, autocomplete, browser extension, API access. |
| Built for | An individual writer checking their own draft. | Teams standardizing on one writing-assistance platform. |
Honest tradeoff: Sapling's detector claims a strong published accuracy rate and its Pro plan is built for teams that need grammar and autocomplete alongside detection — a broader job than Penlify tries to do. But on the free plan specifically, the 2,000-character cap means most real drafts need to be split into pieces just to get checked, and the fix step costs a $25/month subscription either way.
Pricing and feature limits checked against Sapling's official pricing page and AI detector page on 28 August 2026. Plans and pricing can change.
Why a 2,000-character limit matters more than it sounds
2,000 characters is roughly 300 to 400 words — a long paragraph, or a short email. A college essay introduction might just barely fit. A full essay, a client proposal, or a multi-paragraph blog post won't, which means checking it on Sapling's free plan means copying it in sections and losing the single overall picture of where the AI-sounding language actually is.
Sapling's own numbers make the tradeoff explicit: free users get 2,000 characters per check, Pro users get 100,000. That's not a small upgrade — it's the difference between "check a paragraph" and "check a document," and it's gated behind $25 a month billed monthly, or $12 a month if you commit to a year upfront.
Penlify's free plan takes a different shape: no character wall to work around, 3 full detections and 5 rewrites a month, and the paid tier for unlimited use is $2.99 a month — less than the discounted annual rate of Sapling's cheapest paid plan for a single month of Sapling Pro.
Common questions
How long a text can Sapling's free AI detector check?
Up to 2,000 characters per check on the free plan — roughly 300-400 words. Longer documents have to be split into sections and checked separately, or checked through the paid Pro plan's 100,000-character limit. Penlify's free plan doesn't cap check length the same way.
Can you rewrite flagged text on Sapling's free plan?
No. Sapling's rephrase feature is bundled into the Pro plan only, which costs $25/month billed monthly or $12/month billed annually. Penlify includes 5 free rewrites a month with no card required.
Is Sapling more expensive than Penlify?
For rewriting access, yes. Sapling's Pro plan is $25/month monthly or $12/month billed annually ($144/year). Penlify's paid plan is $2.99/month or $24.99/year for unlimited detection and rewriting.
Test the workflow with your own draft
Start with the private analyzer. It gives value without requiring an account or sending the text to Penlify.