InDelve vs Obolus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
InDelve
Read full descriptionHide full description
Track and visualize your reading journey with InDelve - the deep reading companion for complex books. Transform your reading notes into an interactive timeline that reveals story structure, character arcs, and plot connections as you read. Perfect for fantasy series, literary fiction, and any book where you want to remember every detail. KEY FEATURES: Track Story Elements • Characters, plot points, locations, and world-building details • Add notes with page numbers as you read • Create custom categories for themes and symbols • Rich notes with memorable quotes Visual Timeline • See your entire reading journey at a glance • Color-coded dots for each element type • Interactive exploration of story structure • Track your reading position and progress Multi-Book Library • Organize by reading status • Switch between multiple books • Series support with cross-book tracking • Elements carry across series books Smart Organization • Search across all your notes • Filter by category, book, or custom criteria • Sort by page number or recently added • Category summaries and statistics Perfect for readers who want to: • Remember complex character relationships • Track intricate plot threads • Understand world-building details • Prepare for book discussions • Create personal reading archives Whether you're tackling epic fantasy series, dense literary fiction, or academic texts, InDelve helps you engage deeply and retain more. Terms of Use (EULA) - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Obolus
Read full descriptionHide full description
One case a night, sealed until midnight. Obolus is a register of hauntings. It issues one case each night at midnight, and you cannot read ahead. When the night is over the case is yours, entered under your own name, and the next one waits. Thirty cases make Volume I. The Founding Cases run from the house at Athens in the first century to Ballechin in 1897, by way of C**k Lane, Berkeley Square, Hinton Ampner, Epworth and the Bell Witch. Drawn from the written record Every case is built from what people actually wrote down. Depositions, coroners' inquests, Society for Psychical Research proceedings, parish letters, newspaper columns. Mary Ricketts set down what happened at Hinton Ampner in 1772 and her account is still there to be read. No claim of the supernatural is made anywhere in the app. The Register records what was said, by whom, and how well it stands up. Each case takes about fifteen minutes to read, or three to listen to, with narration for every one. Give your finding, then hear the Register's Before the Register gives its reading, you give yours. Explained, unexplained, fraud, or unsupported. Only then does it show its own assessment, scored on independent witnesses, corroboration, natural explanation and the conduct of the inquiry, with a written verdict that will sometimes disagree with you. Then you sign the plate with your finger, and it is entered into the Register under your name. What you keep A holder's card, issued once, in your name. A plate for every case you have signed. A card to send, for any case worth passing on. And, if you want it, the plate itself: a giclée print on Hahnemühle German Etching, 310gsm, posted to you in the United Kingdom or the United States. Volume I is free. All thirty cases, all thirty narrations, no advertising, no account, no subscription. Volume II, The American Cases, is a single purchase when you are ready for it. Volumes III and IV are coming. Obolus keeps nothing about you. Your name and your signature stay on your phone. Only a print order sends anything anywhere, and only then your delivery address.
Screenshots
Verdict
The clearest difference is update cadence: Obolus at weekly against InDelve's every 8 months. InDelve's advantage is iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support 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
Both are free to download. InDelve sells 3 in-app purchases, starting at $2.99 per month and Obolus sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
InDelve ships an update every 8 months, Obolus weekly. The most recent releases landed on October 25, 2026 and September 30, 2026 respectively.
| Parameter | InDelve | Obolus |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 29 MB | 146 MB |
| Age rating | 4+ | 12+ |
| Developer | Mark Edmunds | Jonathan Moore |
In-app purchases
InDelve
- Monthly$2.991 Month
- Annual$29.991 Year
- Lifetime$9.99
Obolus
- Volume II, The American Cases$5.99





