TheGrey.app vs PDF Studio
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
TheGrey.app
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When the Same Thought Keeps Circling Not a crisis. Not a problem that needs solving. Just the same thought, going around once more, still hovering there. THEGREY exists for this state. When a thought keeps circling with no way out β and you don't need a way out yet. Not meditation. Not therapy. Not a mood tracker. No questions about how you feel. No suggestions. No record. γ Why do you need THEGREY? γNot a feature list. The reality you're living right now: β’ The same thought won't stop before sleep: your body is exhausted but your brain refuses to land, the thought grinding in the dark on repeat. β’ Walking into a place brings something back: the space itself is the trigger, old memories spiraling again without warning. β’ A date or anniversary arrives and the thought returns: time's inertia brings regret back automatically, no reason needed. β’ Shallow breathing, physical tension, thought follows: physiological anxiety feeds mental drain, the thought accelerating with your heartbeat. γ Three entry points, three sources of circling γ β’ THIS DAY | Time-triggered: circular thoughts triggered by time or date. Time seems to stand still. β’ THE SPACE | Space-triggered: circular thoughts triggered by location or setting. This space won't let the feeling go. β’ THE BREATH | Rhythm-triggered: circular thoughts triggered by rhythm or stress. The circling that happens between breaths. γ Seven content invariants, strictly observed γNo second person Β· No action directive Β· No future tense Β· No causal framing Β· No self-comfort Β· No shareability design Β· No implied next step. No journal. No history. No progress report. Enter. Stay. Leave. Built on THE GAP Framework. Compliant with GAP-NLP-1.0.
PDF Studio
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Every PDF tool you need β 100% on your device. PDF Studio reads, edits, scans, converts, signs and protects PDFs with no account, no cloud upload and no tracking. Your files never leave your iPhone, iPad or Mac. And it's a one-time purchase β no subscription. SCAN & CREATE β’ Scan documents with automatic edge detection β’ Turn photos or typed text into clean PDFs β’ Make scans searchable with on-device OCR EDIT & ORGANIZE β’ Merge, split, reorder, rotate and delete pages β’ Compress to a target file size β’ Crop, add margins, page numbers and watermarks CONVERT β’ PDF to Word, plain text or images β and back FILL, SIGN & PROTECT β’ Fill forms and sign by hand or with a saved signature β’ Build fillable forms and extract form data to CSV β’ Password-protect, unlock and permanently redact β’ Certify & seal a document and verify it later β fully offline ON-DEVICE AI β’ Summarize, chat with and translate a PDF β nothing is uploaded MEASURE & MORE β’ Distance, area and angle with scale β’ Beautiful on iPhone, iPad and Mac, with iCloud sync for your own library WHY PDF STUDIO β’ Private by design β everything runs on your device β’ Pay once, own it forever β no subscription required β’ No ads, no account, no data collection PDF Studio Pro unlocks every tool with a single purchase or an optional subscription. Terms of Use (EULA): https://birsoftware.com/terms.html
Screenshots
Verdict
The clearest difference is update cadence: TheGrey.app at every 3 days against PDF Studio's weekly. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. TheGrey.app sells 1 one-off in-app purchase and PDF Studio sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.
TheGrey.app ships an update every 3 days, PDF Studio weekly. The most recent releases landed on November 9, 2026 and November 13, 2026 respectively.
| Parameter | TheGrey.app | PDF Studio |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days β better | Weekly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad, Mac β better |
| Requires iOS | 16.0 β better | 17.0 |
| Further details β not scored | ||
| Size | 1 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Hsieh ChiaMing | Birkan Aksoy |
In-app purchases
TheGrey.app
- The Grey Platinum$2.99
PDF Studio
- PDF Studio Pro$9.991 Year
- PDF Studio Pro (Lifetime)$24.99









