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docs: better copy

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docs/guide/alternatives.md
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# Alternatives to Cap
| CAPTCHA | Open-source | Free | Private | Fast to solve | Easy for humans | Small error rate | Checkpoints | Widget support | GDPR/CCPA Compliant | Customizable | Hard for bots | Easy to integrate |
| :-- | :-- | :-- | :-- | :-- | :-- | :-- | :-- | :-- | :-- | :-- | :-- | :-- |
| **Cap** | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | 🟨 | ✅ |
| Cloudflare Turnstile | ❌ | ✅ | 🟨 | 🟨 | ✅ | ❌ | 🟨 | ✅ | ✅ | ❌ | 🟨 | ✅ |
| reCAPTCHA | ❌ | 🟨 | ❌ | ✅ | ❌ | 🟨 | ❌ | ✅ | 🟨 | ❌ | ❌ | ✅ |
| hCAPTCHA | ❌ | 🟨 | 🟨 | ❌ | ❌ | 🟨 | ❌ | ✅ | 🟨 | ❌ | 🟨 | ✅ |
| Altcha | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ | 🟨 | 🟨 |
| FriendlyCaptcha | ❌ | ❌ | ✅ | 🟨 | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ | 🟨 | 🟨 |
| MTCaptcha | ❌ | 🟨 | 🟨 | ❌ | ❌ | 🟨 | ❌ | ✅ | ✅ | ❌ | ❌ | 🟨 |
| GeeTest | ❌ | ❌ | ❌ | 🟨 | 🟨 | 🟨 | ❌ | ✅ | ✅ | ❌ | 🟨 | 🟨 |
| Arkose Labs | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ✅ | 🟨 | ❌ | ❌ |
| CAPTCHA | Open-source | Free | Private | Fast to solve | Easy for humans | Small error rate | Checkpoints | Widget support | GDPR/CCPA Compliant | Customizable | Hard for bots | Easy to integrate |
| :------------------- | :---------- | :--- | :------ | :------------ | :-------------- | :--------------- | :---------- | :------------- | :------------------ | :----------- | :------------ | :---------------- |
| **Cap** | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
| Cloudflare Turnstile | ❌ | ✅ | 🟨 | 🟨 | ✅ | ❌ | 🟨 | ✅ | ✅ | ❌ | 🟨 | ✅ |
| reCAPTCHA | ❌ | 🟨 | ❌ | ✅ | ❌ | 🟨 | ❌ | ✅ | 🟨 | ❌ | ❌ | ✅ |
| hCAPTCHA | ❌ | 🟨 | 🟨 | ❌ | ❌ | 🟨 | ❌ | ✅ | 🟨 | ❌ | 🟨 | ✅ |
| Altcha | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ | 🟨 | 🟨 |
| FriendlyCaptcha | ❌ | ❌ | ✅ | 🟨 | ✅ | ✅ | ❌ | ✅ | ✅ | ✅ | 🟨 | 🟨 |
| MTCaptcha | ❌ | 🟨 | 🟨 | ❌ | ❌ | 🟨 | ❌ | ✅ | ✅ | ❌ | ❌ | 🟨 |
| GeeTest | ❌ | ❌ | ❌ | 🟨 | 🟨 | 🟨 | ❌ | ✅ | ✅ | ❌ | 🟨 | 🟨 |
| Arkose Labs | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ❌ | ✅ | 🟨 | ❌ | 🟨 |
::: tip Note
"Hard for bots" does not consider commercial solvers like BrightData, as I cannot verify their legitimacy myself.
"Hard for bots" for Cap refers to the combination of Proof-of-Work and [dynamic instrumentation challenges](./standalone/options.md#instrumentation-challenges). It does not consider commercial solvers like BrightData, as I cannot verify their legitimacy myself.
:::
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### Cloudflare Turnstile
Cloudflare Turnstile is a great alternative to Cap, but unfortunately it is known for having an extremely high error rate and relies a lot on fingerprinting, especially for users using private browsers such as Brave or Librewolf. Additionally, unlike Turnstile, Cap is open-source and self-hosted.
Cloudflare Turnstile is a great alternative to Cap, but unfortunately, it is known for having an extremely high error rate and relies a lot on fingerprinting, especially for users using private browsers such as Brave or Librewolf.
Additionally, unlike Turnstile, Cap is open-source and self-hosted. With Turnstile, if Cloudflare's algorithm marks a user as "suspicious," you cannot override it. Cap puts the levers of control in your hands, so you decide the difficulty and strictness, not a third party.
### reCAPTCHA
Not only is Cap significantly smaller and faster than reCAPTCHA, it's open-source, fully free and is significantly more private. Cap doesn't require you to check traffic signs or solve puzzles, and it doesn't track users or collect data.
Not only is Cap significantly smaller and faster than reCAPTCHA, it's open-source, fully free, and much more private. Cap doesn't require you to check traffic signs or solve puzzles, and it doesn't track users or collect data.
Additionally, reCAPTCHA v2 challenges can be solved trivially by multi-modal LLMs, especially audio challenges.
reCAPTCHA v2 ("I'm not a robot") is getting harder for humans while remaining trivial for AI solvers (especially audio challenges). v3 (Invisible) is great, but if Google thinks you are "suspicious" (e.g., using a VPN or privacy tools), it often blocks you entirely or forces a hard puzzle loop with no way out.
### hCAPTCHA
Pretty much the same as reCAPTCHA, however while it's significantly more resistant to bots, it is also extremely annoying for users to solve when prompted with a visual challenge compared to reCAPTChA. It also has a significantly bigger bundle size.
Pretty much the same as reCAPTCHA, however, while it's significantly more resistant to bots, it imposes a heavy "Puzzle Tax" on your users.
Additionally, hCAPTCHA is prohibitively expensive for many users, while Cap is completely free and self-hosted.
Users hate puzzles. They leave. Drop-off rates on hCaptcha challenges can be **5-15%** depending on difficulty. Additionally, hCaptcha's free tier is aggressive with serving puzzles to save their own costs, which hurts your conversion rates.
### Altcha
Cap is slightly smaller than Altcha and includes extra features like progress tracking, and a simpler dashboard. if you don't need these, Altcha is a still a solid choice.
Cap is slightly smaller than Altcha and includes extra features like progress tracking, instrumentation challenges, and a simpler dashboard. If you don't need these, Altcha is still a solid choice.
### mCAPTCHA
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### FriendlyCaptcha
Unlike FriendlyCaptcha, Cap is completely free and self-hosted (FriendlyCaptcha is €39/month for 5k requests and 5 domains).
Unlike FriendlyCaptcha, Cap is completely free and self-hosted (FriendlyCaptcha is €39/month for only 5k requests and 5 domains).
### MTCaptcha
Cap is more lightweight, doesn't rely on users solving an image puzzle that LLMs and OCR can easily solve and is open-source and self-hostable.
MTCaptcha relies heavily on image challenges, which are usually easily solvable by LLMs and OCRs and have high drop-off rates. Cap is also lightweight, self-hostable and doesn't rely on obfuscation.
### GeeTest
Cap is free, self-hosted and open-source, while GeeTest is a paid service. Cap is also more private and doesn't rely on tracking users or collecting data. GeeTest is also china-based, which may be a concern for some users.
Cap is free, self-hosted, and open-source, while GeeTest is a paid service. Cap is also more private and doesn't rely on tracking users or collecting data. GeeTest is also China-based, which may be a concern for some users regarding data sovereignty.
### Arkose Labs
Arkose's CAPTCHA is known for being hard, slow and annoying for humans to solve. It is also a paid, closed-source service.
Arkose's CAPTCHA is known for being hard, slow, and annoying for humans to solve. It is also a paid, closed-source service mostly available to big enterprises.
### Anubis
While Anubis is a great scraper deterrent and uses the same proof-of-work concept as Cap, it uses a low difficulty by default (which is easier for bots to solve) and does not provide a standalone CAPTCHA.
While Anubis is a great scraper deterrent and uses the same proof-of-work concept as Cap, it uses a low difficulty by default (which is easier for bots to solve) and does not provide a standalone CAPTCHA server.
Cap also implements dynamic instrumentation challenges, which make it harder for bots to finish the process after solving PoW.
docs/guide/benchmark.md
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<Benchmark />
For accurate results, close the Developer Console, as it may negatively impact performance.
## Benchmark results
These use a placeholder server, speeds might vary depending on your setup and network latency. Please also note that due to a bug in Chromium's devtools, speeds might be slower than expected when devtools is open.
These use a placeholder server, speeds might vary depending on your setup and network latency.
A challenge difficulty of 4 with 50 challenges was used to run these benchmarks.
| Tier | Device | Chrome | Safari |
| --------- | ------------------ | ------ | ------ |
| Low-end | Samsung Galaxy A11 | 4.583s | - |
| Low-end | Samsung Galaxy A11 | 2.926s | - |
| Low-end | iPhone SE (2020) | - | 1.282s |
| Mid-range | Google Pixel 7 | 1.027s | - |
| Mid-range | iPad (9th gen) | – | 1.401s |
| High-end | Google Pixel 9 | 0.894s | – |
| High-end | M3 Macbook | 0.312s | 0.423s |
| High-end | M3 Macbook | 0.412s | 0.423s |
docs/guide/index.md
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Unlike traditional CAPTCHAs, Cap's fast, unobtrusive, has no telemetry or tracking, and uses accessible proof-of-work instead of annoying visual puzzles.
We've found that Cap offers a better balance for site admins than big-tech alternatives because **it puts the levers of control in your hands, not a third party.** You decide the difficulty, you own the data, and you never pay per-request fees.
Cap consists of a client-side widget, which solves challenges and displays the checkbox, and a server-side component, which generates challenges and redeems solutions.
## Integration