Grammarly vs WriteHuman affiliate programs
Grammarly and WriteHuman are AI writing tools that both run affiliate programs. Grammarly lists $0.20 per free signup + $20 per upgrade through Impact; WriteHuman lists 30% through Rewardful. Grammarly lists the longer referral cookie: 90 days against 45. aifilliate records each program from a cited vendor source and does not rank the two.
| Recorded term | Grammarly Verified | WriteHuman Verified |
|---|---|---|
| Commission | $0.20 per free signup + $20 per upgrade | 30% |
| Structure | One-time | Recurring |
| Cookie window | 90 days | 45 days |
| Network | Impact | Rewardful |
| Payout threshold | Not stated | Not stated |
| Terms checked | 2026-08-22 | 2026-08-22 |
| Source | Open source ↗ | Open source ↗ |
What matches, what differs
Differences
- Payout structure differs: one-time against recurring.
- Different platforms: Impact against Rewardful, meaning two dashboards and two payout schedules.
- Grammarly lists the longer referral cookie: 90 days against 45.
In common
- Both are AI writing tools.
What these terms mean in practice
Attribution splits between day 45 and day 90. A referral who clicks today and subscribes on day 68 is still credited by Grammarly, but no longer by WriteHuman.
A customer who stays subscribed for two years pays out on every qualifying renewal with WriteHuman, and once with Grammarly. Which produces more depends on plan price and retention, neither of which appears in published terms.
Promoting both means two applications, two dashboards, and two payout schedules — Impact for Grammarly and Rewardful for WriteHuman, each with its own approval and its own minimum.
Which record fits which promoter
- Grammarly: suits traffic that deliberates before buying — the 90-day window still credits slow conversions.
- WriteHuman: suits audiences that convert quickly; its 45-day window is shorter, so timing matters more.
What is not published
Anything below has to be confirmed with the vendor before either offer can be modelled. aifilliate records it as unknown rather than estimating it.
- Neither vendor publishes a payout threshold.
How to read these two records
These payouts do not share a basis — one is quoted as a percentage, the other as a flat amount per conversion. A percentage of an unknown plan price and a fixed bounty are not the same unit, so aifilliate does not rank them.
Grammarly pays one-time commission and WriteHuman pays recurring, which typically matters more than the headline rate over a customer's lifetime. Grammarly lists the longer referral cookie: 90 days against 45.
aifilliate publishes no ranking between Grammarly and WriteHuman. Which program earns more depends on plan price, conversion rate, retention, and refund reversals in your own audience — none of which appear in published affiliate terms. Confirm eligibility, paid-search and trademark rules, and payout timing with each vendor before promoting either.