User Manual

1. Getting Started — What You'll Need

KIRIBAKO lets you try all features free for 14 days, and no account registration is required. Just install it from the App Store and you can begin right away.

• Supported devices: iPhone / iPad (iOS 15.1 or later)
• Account registration: Not required. Download it and start recording right away
• Trial period: The first 14 days let you try all features for free (no automatic charge)

2. Recording a Catch

When you land a fish, take a photo and record it. The steps are very simple.

1. Start from the capture buttons at the bottom right of HomePick "Photo," "LiDAR," or "Video" at the bottom right of the home screen — the camera opens right away and a new catch record begins. (To create a record without shooting, use the "＋" at the top.)
2. Photograph the fishFrame the fish on screen and shoot. Shooting from directly above, in a bright spot, makes for a clean record. You can also pick a photo from your library.
3. Check the species candidatesOnce you shoot, the on-device AI suggests species candidates from bitterling species and 8 species in total. All identification happens inside your iPhone alone, and your photo is never sent anywhere. Pick from the candidates, or correct it manually.
4. Enter size, notes, and date/timeRecord the length (measured optionally; see the next chapter), a short note, the date and time of the catch, and more.
5. SaveWhen you save, the catch settles into the paulownia box as a "specimen."

▲ The catch detail screen. Record each catch like a specimen.

3. Measuring Length

Even without a measuring tape, you can record an approximate length (fork length) from a photo or a video. There are three measurement methods, selectable when you shoot. First, check which one suits you.

▲ The measurement screen. It estimates an approximate length from the reference.

Method A: Measurement using a coin as reference (📷 standard camera)

Just shoot a 1-yen coin (or a supported overseas coin) together with the fish. Using the coin's actual size as a reference, the app automatically estimates an approximate length from the image. It works on all supported devices.

1. Shoot the fish and coin side by sidePlace a 1-yen coin next to the fish and shoot from directly above. Accuracy improves when the coin is at the same height (the same plane) as the fish.
2. The coin is recognized automaticallyThe app finds the coin and uses it as the reference. If it isn't recognized well, you can adjust its position manually.
3. Align the head and tail pointsAlign the measurement points to the tip of the fish's mouth and the tip of its tail, and the approximate length (mm) is displayed.

Method B: LiDAR coin-free measurement (📏)

This method measures without placing a coin, using the device's LiDAR sensor to gauge depth. Start it from the "LiDAR" button at the bottom right of Home, or select "📏 Measure with LiDAR" on the capture-method sheet — depth information is captured along with the photo.

1. Start shooting with "LiDAR"One tap on the "LiDAR" button at the bottom right of Home. You can also choose it from the capture-method sheet via "Take photo" on the record screen.
2. Shoot from a distance of 20–40cmShoot from directly above, about 20–40cm from the fish. If you are too close (under 20cm), it won't focus and a warning appears. You can also zoom in to get closer.
3. Align the head and tail pointsAlign the measurement points, and an approximate length based on depth is displayed. You can measure even without a coin.
4. (Optional) Including a coin in the shot makes it even more accurateEven with LiDAR capture, if a coin is in the shot, it is used as a reference for correction, making the result more accurate. The coin is an optional accuracy boost that is "handy to have."

Method C: Measure from video (📹, Takumi plan)

From the "Video" button at the bottom right of Home (or "📹 Measure from video" on the capture-method sheet), record a video, then freeze a frame from it to measure the length. On LiDAR-equipped devices this uses LiDAR video measurement; on unsupported devices it automatically falls back to coin video measurement.

1. Start recording with "Video"One tap on the "Video" button at the bottom right of Home. You can also choose it from the capture-method sheet.
2. Frame the fish (and the coin, for coin video measurement) and recordKeep recording until you've captured the moment you want — you don't measure while recording.
3. Stop recordingStopping the recording freezes that frame and switches to measuring mode.
4. Drag the endpoints to align them (a 3x loupe helps with precision)Dragging the head or tail endpoint with your finger shows a circular loupe magnifying the area 3x, so you can fine-tune the position. The length updates automatically while you drag.
5. Share it, or save it as a catchYou can share it as a vertical video with the length overlaid, without any location data. Choosing "Save as catch" saves a single video — with the depth information needed for length measurement embedded in it — straight to the Photos app, and also adds it to your record list as a catch (species and other details can be filled in later from the detail screen).

4. Looking Back on the Map

You can look back on your recorded catches on a map. Keep a record of when, where, and what you caught as your own private field map.

▲ The map screen. Your own private field map.

5. Sharing with Specimen Cards

Turn a favorite catch into a specimen-card-style image and share it to Instagram, X, Messages and more. Discreetly, but beautifully.

▲ The share screen. Export a specimen card.

1. Choose Share from a catchCreate a share card from the detail screen of a recorded catch.
2. Export the cardOnly a safe card image — with location and photographer info automatically removed — is exported.
3. Share with any app you likeSend it to social media or messaging apps. It contains no information that could identify your fishing spot.

Remove the coin or stray objects

The 1-yen coin used for measuring, or small stray objects in the background, can be cleanly removed from the share card (Takumi plan). Tap “Edit in full screen” on the share screen to open a full-screen editor where you can work on a larger photo. Zoom by pinching with two fingers, and swipe with one finger to pan.

1. Open “Edit in full screen”Tap “Edit in full screen” on the share screen to open the full-screen editor. All coin and object removal is done here.
2. Turn on “Remove coin”Toggle it on in the editor to automatically remove the coin. If the position is off, just “tap” the coin and it re-erases there right away. Use the “− Coin size +” control to fit the removal area tightly to the coin so it doesn’t overlap the ruler.
3. Use “Remove objects” for stray itemsTurn the toggle on, then tap the two opposite corners of the area you want to remove. The first tap sets a corner (yellow marker), the second defines the enclosed box, and that rectangle is erased. Zoom in first for finer control. Use “↶ Undo” to revert.
4. Tap “Done”, check the result and exportClose the editor, make sure the edit looks natural, then export the share card. Your original photo is never changed.

If You Run Into Trouble

If you have questions, bug reports, or requests, please feel free to get in touch. This is an app nurtured with care, one piece at a time, by a small team. Your voices are the strength that helps us keep each next catch more beautifully.