Switch from NextCaptcha to CaptchaAI for broader coverage and a longer track record.
Same submit-then-poll pattern — but with image/OCR (27,500+ types), GeeTest v3 and BLS, which NextCaptcha doesn't list, and thread-based pricing with unlimited solves per thread that flattens cost as you scale.
# NextCaptcha: build a JSON task object - requests.post("https://api.nextcaptcha.com/createTask", json={ - "clientKey": KEY, - "task": {"type": "RecaptchaV2TaskProxyless", - "websiteURL": url, "websiteKey": sitekey}}) # CaptchaAI: plain REST query params + requests.post("https://ocr.captchaai.com/in.php", data={ + "key": KEY, "method": "userrecaptcha", + "googlekey": sitekey, "pageurl": url})
A small field mapping — the submit-then-poll flow stays the same.
Supported CAPTCHA types
Two things developers reconsider
NextCaptcha is fine to start. Growth surfaces two limits.
NextCaptcha is a newer service that handles reCAPTCHA and Cloudflare Turnstile. But its docs list no image/OCR task type, and its per-solve billing grows with every solve. As your targets and volume grow, here's what changes on CaptchaAI.
Why teams move
Five reasons developers switch from NextCaptcha
1. Broader image / OCR
A wide 27,500+ image/OCR type set, where NextCaptcha's docs list no image/OCR task type. Fewer "unsupported type" gaps as your targets vary.
2. GeeTest v3 & grid image
GeeTest v3 slider puzzles and reCAPTCHA-style grid images, returned as the tiles to click — neither is in NextCaptcha's task list.
3. BLS CAPTCHA
BLS multi-image CAPTCHA for visa-appointment portals — a type NextCaptcha doesn't list.
4. Flat cost at scale
Pay per concurrent thread with unlimited solves per thread. Above roughly 30K solves/month the thread model is structurally cheaper than per-solve billing.
5. SDKs & examples
Official SDKs for Python, Node.js, PHP and Go, plus code examples in Java, C#, Ruby and more. NextCaptcha's SDKs cover Python, Node.js, Go and C#, with no PHP SDK.
Trial to test first
Validate CaptchaAI on your own targets with a 3-day trial (5 threads) or a free thread for 30 days, before you move production traffic.
Migration
Map the fields, keep the workflow
CaptchaAI doesn't emulate NextCaptcha's JSON format — but the submit-then-poll flow is the same. Convert the task object to query parameters and switch your response parsing from JSON to CaptchaAI's REST response.
createTask→in.php,getTaskResult→res.php?action=get"type":"RecaptchaV2TaskProxyless"→method=userrecaptchawebsiteKey→googlekey,websiteURL→pageurl- Parse the REST response instead of
solution.gRecaptchaResponse
import requests, time API_KEY = "YOUR_CAPTCHAAI_KEY" API_URL = "https://ocr.captchaai.com" def solve_recaptcha(sitekey, pageurl): # Submit (was NextCaptcha createTask) r = requests.post(f"{API_URL}/in.php", data={ "key": API_KEY, "method": "userrecaptcha", "googlekey": sitekey, "pageurl": pageurl, "json": 1, }) task_id = r.json()["request"] # Poll (was NextCaptcha getTaskResult) for _ in range(60): time.sleep(5) res = requests.get(f"{API_URL}/res.php", params={ "key": API_KEY, "action": "get", "id": task_id, "json": 1, }).json() if res["request"] != "CAPCHA_NOT_READY": return res["request"] raise TimeoutError("Solve timeout") # Start a 3-day trial at captchaai.com/trial to get your API key
Side by side
CaptchaAI vs NextCaptcha
Capability coverage, from each service's own documentation; our solve time is from our own daily test solves — see the evidence note.
| Feature | CaptchaAI | NextCaptcha |
|---|---|---|
| reCAPTCHA v2 / v3 / Enterprise | ||
| Cloudflare Turnstile | ||
| Cloudflare Challenge (full page) | ||
| GeeTest | v3 | |
| Image / OCR types | 27,500+ | |
| BLS CAPTCHA | ||
| SDK languages | Python, Node, PHP, Go | Python, Node, Go, C# |
| Typical reCAPTCHA v2 solve time | Under 2 min | Faster |
| Track record | Established | Newer service |
| API style | REST (query params) | JSON POST tasks |
| Billing model | Per thread (unlimited solves) | Per solve |
| Free way to test | Free thread (30 days) |
Where NextCaptcha may fit: it's a newer service that can be cheaper at low volume, so for a brand-new project that only needs reCAPTCHA or Cloudflare Turnstile it's worth a look. For broad OCR, GeeTest v3, BLS, an established track record, and flat cost at scale, CaptchaAI is the stronger match.
Illustrative pipeline
What changes day to day
Representative example for a high-volume reCAPTCHA pipeline. Your numbers depend on target sites and proxy quality.
Before — NextCaptcha (per-solve, JSON)
After — CaptchaAI (REST, thread-based)
Pricing
Pay per thread. Unlimited solves.
A thread is one in-flight CAPTCHA. It frees up the moment it finishes — so you size by concurrency, not by solve count. No per-CAPTCHA fees, no type surcharges.
Larger plans — CORPORATE ($240/mo, 150 threads), ENTERPRISE ($300/mo, 200 threads), and VIP tiers up to 5,000 threads. See full pricing →
Where the gap widens at scale
| Monthly reCAPTCHA v2 volume | NextCaptcha (per-solve) | CaptchaAI plan | CaptchaAI cost | You save |
|---|---|---|---|---|
| 10,000 solves | ~$5 | BASIC (5 threads) | $15 | NextCaptcha cheaper |
| 100,000 solves | ~$50 | BASIC (5 threads) | $15 | ~70% |
| 1,000,000 solves | ~$500 | ADVANCE (50 threads) | $90 | ~82% |
| 10,000,000 solves | ~$5,000 | 2× ENTERPRISE (400 threads) | $600 | ~88% |
Illustrative — and honest about the low end: at ~10K solves/month NextCaptcha's per-solve rate (~$0.50 / 1,000, accessed September 2026) can be cheaper. Above roughly 30K solves/month the thread model wins, because once threads are paid for, additional volume runs through them at zero marginal cost. Confirm live numbers on captchaai.com/#pricing-plans.
Stop paying per solve. See what flat pricing saves you.
Per-solve services bill every single solve, so your cost climbs with volume. CaptchaAI bills by concurrent threads with unlimited solves - so past a break-even point, a flat plan wins. Pick your captcha type and volume below and watch the lines cross.
Cost vs volume - where the line crosses
Per-solve cost rises with every solve; CaptchaAI steps up only when you need more concurrent threads. The shaded gap after the crossover is your monthly saving at that volume.
Why the model differs
Per-solve pricing is linear: 2× the volume is 2× the bill. Thread-based pricing is flat - you pay for how many solves run at the same time, and within that you solve as many as you want. High, steady volume is where flat pricing pulls ahead.
What's a thread, honestly
One thread = one captcha solving at that instant. Size your plan to your peak concurrency, not your average - a trial reads your real peak fastest. Go over and extra requests wait for a free slot rather than costing more.
Coverage
reCAPTCHA v2/v3, Cloudflare Turnstile & Challenge, GeeTest, BLS, Grid Image and 27,500+ image captchas - all on drop-in 2Captcha-compatible endpoints. Full type list below ↓
Lock in these savings
Every plan includes unlimited solves and the same 2Captcha-compatible API - pick the tier that covers your peak concurrency, or test free on your own traffic first.
FAQ
Frequently Asked Questions
Yes. You update the API call format from NextCaptcha's JSON createTask to CaptchaAI's REST in.php / res.php and switch response parsing. The workflow is identical (submit a task, poll for the result), so the migration is straightforward.
For a single integration point it is usually quick — convert the JSON task object to query parameters (type → method, websiteKey → googlekey, websiteURL → pageurl) and switch your response parsing. The submit-then-poll control flow stays the same.
Yes. Every new account can start a 3-day trial with 5 threads — start it at captchaai.com/trial (then $15/month via PayPal unless you cancel) — or claim a free thread for 30 days. Run CaptchaAI and NextCaptcha in parallel on the same workload, compare on your real targets, then cut over when you are satisfied.
If you are starting a brand-new project that only needs reCAPTCHA or Cloudflare Turnstile, or your monthly volume is low enough that NextCaptcha's per-solve rate works out cheaper, it can be a reasonable fit. Run both on a trial and compare for your specific use case.
It depends on volume. NextCaptcha's per-solve rate can be cheaper at low monthly volume (around 10K solves). Above roughly 30K solves/month the thread model is typically cheaper because each thread does unlimited solves. Compare your monthly solve count against a thread tier on the pricing page.
CaptchaAI covers a broad 27,500+ image/OCR set, grid images, GeeTest v3 and BLS multi-image CAPTCHA. None of these is in NextCaptcha's documented task types, which cover reCAPTCHA and Cloudflare Turnstile, including a cf_clearance task for Cloudflare's 403 page. CaptchaAI also ships an official PHP SDK, which NextCaptcha doesn't.
Need more help? Check CaptchaAI Help Center
Ready to switch? Test it first, then map the fields.
Start a 3-day trial, point your solver at ocr.captchaai.com,
and run a real solve. Keep NextCaptcha alongside until you're confident.
Evidence & sources
CaptchaAI's capability coverage is from its published supported CAPTCHA types
(api-docs), and its SDKs are at github.com/captchaai. Its reCAPTCHA v2 solve time comes from our own synthetic canary, which runs test solves on 14 CAPTCHA types every day.
NextCaptcha's is from its own documentation (nextcaptcha.com/apidocs):
reCAPTCHA v2/v3/Enterprise/Mobile and Cloudflare Turnstile tasks, including a TurnstileTask that returns a
cf_clearance cookie for Cloudflare 403 pages, and no image/OCR, GeeTest v3 or BLS task. Its pricing page lists
a reCAPTCHA v2 solve speed under 6 s, and its SDKs (Python, Node.js, Go, C#) are at github.com/nextcaptcha, where the first was published in March 2024.
Cost examples use published CaptchaAI plans (captchaai.com/#pricing-plans) and NextCaptcha's published reCAPTCHA v2 rate (~$0.50 / 1,000), both accessed September 2026. At low volume NextCaptcha can be cheaper; the thread model wins at scale. Pricing and supported types change over time — confirm current numbers before relying on them. Solve times are representative, not guaranteed; results vary by target site and proxy quality.
