Grounded in real lesson pain points
In music lessons, tone, nuance, and precise guidance need to come through clearly. Remosse stays 1:1-first and is designed backward from what actually breaks in the field.
STONEHASH SOLUTION
ストーンハッシュソリューション · Kawasaki, Kanagawa, Japan
STONEHASH SOLUTION builds and operates our own product, Remosse, while working on real-time calling, web and mobile development, technical support, and business planning. We draw on hands-on experience running a live product—not just slide decks—to help you start small and grow sustainably.
Flagship product
We offer Remosse, a video-calling app for online music lessons, for iPhone and iPad.
What we can do
Planning and implementation of real-time calling, web/mobile development support, technical clarification, and product strategy.
Good fit if…
You are a small team, exploring a new business, or still at the idea stage and want to move forward through conversation.
STONEHASH SOLUTION on this site is based in Japan and is not affiliated with the Singapore-based operator of stonehash.com.
NOW ON APP STORE · Remosse
With Remosse,
music lessons flow more smoothly.
Remosse is a 1:1 video-calling app built for music lessons.
It is tuned so instrument sound and the teacher’s guidance are easier to hear than on typical consumer video chat.
Download on the App Store. For free trials and pricing, see the Remosse website.
STONEHASH SOLUTION also offers development support for services that include calling, based on what we learned building Remosse.
- 1:1 calling focused on clear instrument sound and instructions
- QR invites and a simple UI so students can join easily
- Product design shaped for schools and private lessons
Remosse is both our flagship work and our lab
General meeting tools are great for meetings, but online music lessons often suffer from dropped audio or instruments treated as noise.
Remosse is our in-house answer to those problems—and a concrete example of the kind of technical support STONEHASH SOLUTION can provide.
For the latest on Remosse and full feature details, visit the Remosse website.
From planning through continuous improvement
We keep iterating on QR-based joining, host quotas, backgrounds, and more—planning, shipping, and refining in a loop. That is the “operate while you grow” product muscle, not one-off delivery.
Lessons we apply to other builds
Real-time calling, mobile UI, onboarding, MVP polish—what we learn on Remosse transfers to other services. We pair especially well with “start small” engagements.
Key app screens
Captured on a real iPhone (UI at time of capture). For other features and the latest UI, also check the Remosse website and App Store screenshots.
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Lesson list Manage instant, scheduled, and past lessons in one place. -
QR invite The host issues a QR code; the guest scans to join. -
Backgrounds & filters Choose virtual backgrounds and beauty filters (availability varies by plan). -
Connection check Review connectivity before you enter the room. -
Microphone Balance performance and conversation for clearer sound.
Built for 1:1, up to two people
Most music lessons are one host and one guest. Remosse caps participation at two people on purpose—keeping the UI and internals simpler so call quality and reconnection behavior are easier to control.
- Online music lessons: one host, one guest
- One-to-one lessons at music schools
- Private and personal instruction
Audio tuned for lessons
On typical video chat, instrument sound may be gated as noise or cut in and out. Remosse continuously tests and refines settings so both performance and speech stay intelligible.
- Design emphasis on keeping instrument audio as continuous as possible
- Balanced levels for host and guest voices
- Ongoing improvements driven by real lesson feedback
Typical conversations we’re a good fit for
A few entry themes so it is easier to see what you might ask us to help with.
You want to embed calling
1:1 calls, interviews, lessons, advisory—experience design that includes real-time communication.
You want to ship an app or MVP
From clarifying the idea through first implementation and a learn-and-improve loop.
You want to improve an existing product
UI/UX, codebase hygiene, how to sequence features, and untangling technical blockers.
Services
We apply what we learned building Remosse—real-time calling and mobile—to help you
clarify plans, implement, and improve: a partner for starting small and growing deliberately.
Real-time calling: planning and development
Using stacks such as Agora, we support planning, implementation, and validation for web and mobile apps that include calling.
- Requirements, design, and build for 1:1 calling services
- Adding calling to an existing product
- Quality, reconnection, and UX improvements
Web and app development partner
For small teams and startups: from requirements through implementation and iterative improvement in production.
- Small SaaS and web services
- iOS development, design review, technical support
- Improving and refactoring existing codebases
Business planning and product clarity
So “what to build, how far to go” does not stay fuzzy, we bridge business intent and technical reality.
- Product concept and MVP definition
- PoC and pilot design and validation
- Roadmaps for learning while shipping small
About the business
STONEHASH SOLUTION builds products like Remosse in-house and provides technical support for clients.
We connect engineering and business carefully and care about how the product feels in real use.
- Name
- STONEHASH SOLUTION（ストーンハッシュソリューション）
- Location
- Kawasaki, Kanagawa, Japan
- Activities
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Planning and development of real-time calling services, web/mobile development support,
in-house product development, business and product strategy support, and related work
Contact
Remosse adoption or partnership, services built around online calling,
web/mobile development, technical support, or product planning—please get in touch.
Small teams and individuals
“Just exploring” or “still fuzzy” is fine.
We often start by helping you organize where you are today.
Companies looking for a build or integration partner
Scoped feature work or short technical support for an existing team—we can be flexible.
We can also talk under NDA after it is signed.
Helpful to share up front
Even rough notes help: what you want to build, what is blocking you, your current team setup, and desired timing.