Comparison

Prompt Engineering Library vs Crisp Scan

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Prompt Engineering Library

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Prompt Library is the easiest way to save, organize and reuse your favorite prompts across all your AI tools. Whether you're a writer, student, developer or creator, this apps keeps your best ideas at your fingertips. Key features: - Organize prompts - One-tap copy - Favorites No more scrolling through notes or losing track of your best ideas. With Prompt Library, you'll have your AI toolkit ready whenever inspiration strikes. Supercharge your workflow today with Prompt Library.

About

Crisp Scan

Features
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Crisp Scan is a document scanner that respects your time and your data. Scan receipts, contracts, IDs, business cards, and any paperwork with the iPhone or iPad you already carry. Crisp finds the page edges automatically, corrects the perspective, cleans up the image, and runs on-device OCR so every word becomes instantly searchable. Everything stays on your device. No account. No cloud upload. No tracking. No ads. No watermark — ever. If your iPhone is offline, Crisp still works, because there's nothing it needs to phone home. One-time purchase. No subscription, no auto-renewing "free trial," no obvious feature held hostage behind a recurring charge. Buy Crisp Pro once and it's yours forever — restorable across your Apple ID anytime. SCAN • Auto edge detection + perspective correction — Apple-quality scans • Multi-page documents, add pages anytime, drag to reorder • Use the camera or import existing photos FIND ANY WORD • On-device OCR turns every scan into searchable text • Search your whole library instantly — by title and by contents ENHANCE EVERY PAGE • Filters: Auto-enhance, Color, Grayscale, Black & White • Rotate and fine-tune — non-destructive, so your original is never lost ORGANIZED LIBRARY • Custom folders, fast search, multi-page documents • Up to three folders free; unlimited with Crisp Pro EXPORT • Searchable PDF — free, no paywall, no watermark • Plain PDF or JPEG images • Page sizes: Auto, A4, US Letter, Business Card, ID TRULY PRIVATE • No account, no cloud, no tracking, no analytics, no third-party SDKs • Optional iCloud sync uses YOUR private iCloud (off by default) CRISP PRO ($4.99, ONE-TIME) • Unlimited custom folders • Batch export multiple documents at once • Password-protected PDFs • Advanced filter controls — brightness & contrast fine-tuning • Alternate app icons NO NONSENSE • No watermark Ā· No subscription Ā· No ads Ā· No data collected Ā· Works offline • Restore Purchase actually works — sandboxed and tested • Made for the iPhone and iPad you already own Whether you're scanning a single receipt or organizing years of paperwork, Crisp is the scanner that gets out of your way.

Screenshots

Prompt Engineering Library4 screens
Crisp Scan4 screens

Verdict

The call

The clearest difference is price: Crisp Scan at Free against Prompt Engineering Library's $0.99. Crisp Scan also leads on update cadence (every 6 days vs every 3 weeks). Prompt Engineering Library's advantage is in-app purchases (none vs 1) and iOS requirement (15.1 vs 17.0). On ads and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Crisp Scan is free to download; Prompt Engineering Library costs $0.99 up front. Crisp Scan sells 1 one-off in-app purchase. Prompt Engineering Library asks for nothing beyond the download.

UpkeepUpdate frequency

Prompt Engineering Library ships an update every 3 weeks, Crisp Scan every 6 days. The most recent releases landed on September 13, 2026 and September 22, 2026 respectively.

Scorecard4 real differences Ā· 2 level
Prompt Engineering Library versus Crisp Scan: the parameters behind the verdict, then further details
ParameterPrompt Engineering LibraryCrisp Scan
Price$0.99Free — better
Update frequencyEvery 3 weeksEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better17.0
Further details — not scored
Size30 MB1 MB
Age rating4+4+
DeveloperRuud TelmanVikram Joshi

In-app purchases

None

Prompt Engineering Library

No in-app purchases

1 purchases

Crisp Scan

One-time1
  • Crisp Pro$4.99

Questions

Is Prompt Engineering Library free?
Prompt Engineering Library costs $0.99, with no in-app purchases.
Is Crisp Scan free?
Crisp Scan is free to download, with in-app purchases available.
Do Prompt Engineering Library or Crisp Scan have ads?
Neither Prompt Engineering Library nor Crisp Scan shows ads.
Which is updated more often, Prompt Engineering Library or Crisp Scan?
Prompt Engineering Library ships an update every 3 weeks, and Crisp Scan every 6 days. Most recently, Prompt Engineering Library was updated on September 13, 2026 and Crisp Scan on September 22, 2026.

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