Head to head · Writing · updated Oct 26, 2026
GPTZero vs Sapling
GPTZero scores 33 to Sapling's 18 on public evidence for AI content detection, and they rank #2 and #3 there. Both are free to start. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
GPTZero
An AI-text detector for educators with sentence-level highlighting and a writing-process report.
+ Highlights which sentences look AI-generated and offers a Google Docs writing replay as supporting evidence.
− Like all detectors it produces false positives, particularly on non-native English writers.
Sapling
Writing assistant for support teams, with a free AI-content detector.
+ The detector is free and gives a per-sentence score.
− Detection is a side feature - the product is really autocomplete for agents.
Side by side
public evidence| GPTZero | Sapling | |
|---|---|---|
| Evidence score / 100 | 33 | 18 |
| GitHub stars | closed source | closed source |
| Hacker News stories, 30d | 0 | 1 |
| Release-feed mentions, 30d | 0 | 0 |
| Last activity | – | – |
| Pricing | Free tier · Essential from $8.33/mo billed annually | Free tier · Free detector and basic assistant; paid per seat |
| Platforms | web, chrome-extension, api | web, api, chrome-extension |
| Maker | GPTZero | Sapling.ai |
Which one?
Pick GPTZero if
- you want the stronger public evidence (33 vs 18)
Best for classroom AI-writing checks.
Pick Sapling if
The detector is free and gives a per-sentence score.
Best for support replies plus a free detector.