Comparison

Solid Diary vs AI Plagiarism Check PRO

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

Head to head
About

Solid Diary

This private journal app offers AI-powered insights into your thoughts and emotions. Secure your entries with encryption and biometric locks. Organize your reflections with formatting, tags, and unlimited uploads of images, voice, and sketches.

Highlights
  • 100% private and encrypted diary
  • AI analysis for deeper insights
  • Unlimited image, voice, and sketch uploads
  • Formatting and tagging for organization
  • Customizable themes
  • Stats and achievements
Features
Read full description

No subscriptions - Buy once, keep forever End your day with a moment of calm reflection. Solid Diary is more than just a journal app - it could be your sanctuary. Dive deep into your thoughts, and with the unique AI analysis, reveal deeper insights into yourself and the complex world around us. - 100% private diary What you write about in Solid Diary is for your eyes only. This diary is designed with privacy in mind and this is why your data is encrypted and only you can access it. You can also lock your diary with a biometric lock. - AI analysis Keeping a diary is a great way to explore your thoughts and better understand your emotions. But when you need an extra opinion, you can ask for an AI analysis and get a deeper understanding of the meaning behind your writing. - Unlimited uploads You can upload as many images, voice recordings and sketches as you need - Formatting and tags You can apply various formatting options to each entry and stay organized with tags. - Themes Solid Diary supports 4 different themes so you can pick the one that suits your style most. - Stats and achievements To make keeping a diary even more fun, there are achievements and stats that you unlock on your journey. Are you ready to start keeping your diary? Solid Diary is a universal app available on iOS, iPadOS, and macOS You can choose to unlock just this app or all 5 Solid Apps with one purchase Terms of service: http://solidapps.co/terms.html Privacy policy: http://solidapps.co/privacy.html

About

AI Plagiarism Check PRO

Features
Read full description

Build a private, timestamped record that shows you wrote it, over time. PROOF keeps a defensible history of your real writing process, then scans text for AI signals when you need evidence to stand behind. WRITING RECEIPTS (free, unlimited, offline) - Save a checkpoint of your draft any time. PROOF records the timestamp, word count, a diff against your last checkpoint, and a SHA-256 content fingerprint. - A clear timeline of how your draft grew, kept entirely on your device. - Protect yourself from false accusations by showing your work as it happened. AI ANALYSIS (on demand) - Authorship scan: per-sentence signals of AI-leaning or human-leaning writing, reported as a band with a confidence level. No fake percentage, no verdict. - Citation check: reviews your citations against APA, MLA, Chicago, or Harvard. - Source trace: searches the open web for close matches to your phrasing (a general web search, not an academic database). - Full report: authorship and source trace combined. VOICE PROFILE - Calibrate a baseline from your own past writing. Later scans flag voice drift, a passage that reads unlike your usual style. Drift is a prompt to look closer, not proof of anything. PROJECTS AND INSIGHTS (free, on device) - Organize work into projects with deadlines and local reminders, plus a Quick Scans bucket. - See words written this week, rolling 30 and 90 day windows, an activity heatmap with your streak and busiest day, and readability metrics. SHARE FROM ANY APP - Send text from another app into PROOF to checkpoint or scan it. PRIVACY BY DESIGN - No account, no sign in, no ads, no tracking, no analytics. - Everything stays on your device. The only data that ever leaves is the specific text you choose to submit for a scan, sent over an encrypted HTTPS connection to a third-party AI provider for analysis. - Erase everything at any time. AN HONEST TOOL No tool can prove how a text was written. PROOF reports evidence and its strength, so treat it as one signal, never a verdict. Detection is weaker on short, heavily edited, translated, or non-native English text. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Solid Diary4 screens
AI Plagiarism Check PRO4 screens

Verdict

The call

The clearest difference is price: Solid Diary at Free against AI Plagiarism Check PRO's $1.99. AI Plagiarism Check PRO's advantage is update cadence (fortnightly vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Solid Diary is free to download; AI Plagiarism Check PRO costs $1.99 up front. Solid Diary sells 2 one-off in-app purchases and AI Plagiarism Check PRO sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Solid Diary ships an update every 2 months, AI Plagiarism Check PRO fortnightly. Both last shipped on October 12, 2026.

Scorecard2 real differences · 8 level
Solid Diary versus AI Plagiarism Check PRO: the parameters behind the verdict, then further details
ParameterSolid DiaryAI Plagiarism Check PRO
PriceFree — better$1.99
Rating5.0 (26 ratings) — better—
Positive reviews86.4% of reviews—
Number of ratings26 — better—
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaid—
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size44 MB6 MB
Age rating4+4+
DeveloperSolid Apps S.R.L.Aneesh Pradeep

In-app purchases

2 purchases

Solid Diary

One-time2
  • Unlock this app (lifetime)$4.99
  • Unlock ALL 10 Solid Apps (lifetime)$9.99
4 purchases

AI Plagiarism Check PRO

One-time4
  • 10 Credits$3.99
  • 25 Credits$8.99
  • 60 Credits$17.99
Show 1 more
  • 120 Credits$34.99

Questions

Is Solid Diary free?
Solid Diary is free to download, with in-app purchases available.
Is AI Plagiarism Check PRO free?
AI Plagiarism Check PRO costs $1.99, and also offers in-app purchases.
Do Solid Diary or AI Plagiarism Check PRO have ads?
Neither Solid Diary nor AI Plagiarism Check PRO shows ads.
Which is updated more often, Solid Diary or AI Plagiarism Check PRO?
Solid Diary ships an update every 2 months, and AI Plagiarism Check PRO fortnightly. Most recently, Solid Diary was updated on October 12, 2026 and AI Plagiarism Check PRO on October 12, 2026.

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