JSlate vs HDRI Studio
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
JSlate
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[Elevate Your Workflow. High-Precision Timer for the AI Era.] JSlate is a high-precision timer and logging tool built for professional video production - from live broadcast to film and commercial sets. Featuring a minimalist "equipment-grade" UI, it provides advanced logging capabilities optimized for next-generation AI analysis. [Key Features] (1) TIMER Mode: Precise Progress Management High-Precision Timecode: Professional digital font for maximum on-set visibility. Flexible Time Settings: Configure start time by the second and countdown modes. Independent Tracking: Measure time independently from the real-time clock - ideal for broadcast segments. Industry Standards: Supports multiple frame rates (24/30/60fps) and 00/01/10H display modes. (2) SHOT Mode: Next-Gen Field Logging Digital Slate: Large, intuitive Scene/Cut/Take display for fast identification. One-Tap Logging: Instantly record every take with a single tap. AI Workflow Integration: Manage all take logs in a comprehensive list for seamless export to AI analysis or post-production. Smart Auto-Reset: Automatic reset function linked to the start of recording (REC). [Built on Professional Trust: Three Zeros] Confidentiality and speed are our priorities. Zero Setup: No account creation or login. Ready to use immediately after installation. Zero Data Leaks: 100% local design. No server communication ensures your sensitive data stays on your device. *Note: Location data used for local logging only. Zero Cost: Completely free. No ads or in-app purchases to interrupt your professional work. [Target Users] Broadcast Directors & Timekeepers Cinematographers & Script Supervisors Independent Creators pursuing professional quality Editors building AI-driven post-production workflows
HDRI Studio
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Light your 3D scenes with real light. HDRI Studio turns the place you are standing in into a relative scene-linear, 32-bit OpenEXR (.exr) environment map for image-based lighting, realistic reflections, VFX, archviz, and product rendering. HDRI Studio guides your iPhone through 26 positions around a full sphere and automatically captures RAW exposure brackets when you are aimed and steady. Hosted processing merges the brackets, corrects the ultra-wide lens, and stitches a 360° equirectangular panorama. Save the finished .exr to Files or export it for use in any 3D or compositing tool that supports OpenEXR. No chrome ball, dedicated panorama camera, or capture rig is required. OUTPUT YOU CAN USE ⢠RGB, 32-bit floating-point OpenEXR (.exr) ⢠Exact 2:1 equirectangular 360° panorama ⢠PIZ compression with linear Rec.709/D65 color metadata ⢠4K (4096 Ć 2048), with 8K (8192 Ć 4096) where available ⢠Standard float channels for environment and world textures CAPTURE WITH CONFIDENCE ⢠Guided 26-point coverage, including zenith and nadir ⢠Configurable RAW exposure brackets and dynamic range ⢠Automatic capture only when aimed and steady ⢠Locked focus and white balance across the sphere ⢠Lens calibration and measured device pose for stitching PREVIEW, INSPECT, EXPORT ⢠Explore results in a swipe- and gyro-controlled 360° viewer ⢠Adjust preview exposure from ā4 to +6 EV without changing the EXR ⢠Inspect dimensions, channels, compression, file size, peak and mean radiance, and contrast EV ⢠Open compatible .exr files from Files and inspect them in your Library ⢠Review every capture position and its brackets in the shot gallery ⢠Reprocess a saved capture at another available resolution ⢠Keep finished EXRs in your private iCloud Drive with iCloud Library (RAW brackets stay on device) ⢠Export the complete original RAW bracket set plus capture metadata with Pro FOR REAL 3D WORKFLOWS Import the .exr as an environment or world texture for: ⢠Image-based lighting and realistic reflections ⢠Look development and rendering ⢠VFX and compositing ⢠Architecture and product visualization Use it in Blender, Unreal Engine, Nuke, Houdini, Cinema 4D, Maya, and other OpenEXR-compatible tools. Your captures remain yours to use in personal or commercial projects. NO ACCOUNT REQUIRED Capture, Library access, previews, and downloaded EXRs do not require a subscription. Two starter render credits are included. Additional hosted renders use one-time render credits or Pro. 4K uses one credit; 8K uses four. Failed or cancelled renders return reserved credits. Processing requires an internet connection. Captures and downloaded EXRs remain on your iPhone until you delete them. If you enable iCloud Library, finished EXRs, thumbnails, and Library metadata are also stored in your private iCloud Drive so they can be restored; original RAW brackets are not uploaded to iCloud. Temporary hosted results are retained privately for up to 7 days so interrupted downloads can resume. REQUIREMENTS ⢠iOS 17 or later ⢠An iPhone with a RAW-capable ultra-wide camera ⢠Internet connection for processing Privacy Policy: https://hdristudio.app/privacy Terms of Use: https://hdristudio.app/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: JSlate at none against HDRI Studio's 3. JSlate also leads on update cadence (every 2 days vs weekly). On price, ads, device support and iOS requirement 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
Both are free to download. HDRI Studio sells 3 in-app purchases, starting at $19.99 per month. JSlate asks for nothing beyond the download.
JSlate ships an update every 2 days, HDRI Studio weekly. The most recent releases landed on October 25, 2026 and October 22, 2026 respectively.
| Parameter | JSlate | HDRI Studio |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days ā better | Weekly |
| Ads | No | No |
| In-app purchases | No ā better | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 18.0 | 17.0 ā better |
| Further details ā not scored | ||
| Size | 5 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | KEISUKE TONE | Gianluca Gatto |
In-app purchases
JSlate
No in-app purchases
HDRI Studio
- Pro$19.991 Month
- 4K Render Credit$2.99
- 8K Render Credit$7.99









