SonarPen
SonarPen, operated by Hong Kong-based GreenBulb Trading Limited, designs and sells battery-free pressure-sensitive smart styluses that use a host device's audio jack or USB-C port for pressure detection, serving digital artists, students, and casual users across iOS, Android, Windows, Mac, Chromebook, and Nintendo Switch.
- Company typePrivate
- Founded2018
- HeadquartersKowloon City, Hong Kong SAR China
- Headcount11–50
- GTM typeB2C
- OfferingHardware or Manufacturing
What SonarPen does
SonarPen, operated by Hong Kong-based GreenBulb Trading Limited, designs and sells battery-free pressure-sensitive smart styluses for digital artists, students, and casual users across iOS, Android, Windows, Mac, Chromebook, and Nintendo Switch. The company launched in 2018 via a Kickstarter campaign and distributes globally direct-to-consumer through its own online store shipping from Kowloon, Hong Kong, with no disclosed presence in major physical retail channels.
The core technology exploits the host device's audio jack — and, on newer variants, the USB-C port — to leverage the device's built-in analog-to-digital converter for pressure detection, eliminating internal batteries and Bluetooth pairing. Three product variants are offered: the original SonarPen at $39.50, the SonarPen USB-C at $41.00, and the SonarPen 2 launched in 2025 at $45.00. The product line is supported by an accessory ecosystem including replacement nib sets, Lightning and USB-C adapters, and carrying pockets, and is compatible with drawing and note-taking apps including Zen Brush 3, Colors Live, and ibis Paint.
The business model is one-time hardware sale with no subscription component. Revenue is generated through D2C e-commerce at $39.50–$56.00 price points, supplemented by a 10% commission affiliate program for referral traffic. Customers are fragmented across individual digital artists, students, Nintendo Switch users of Colors Live, and casual mobile users, and the company reports a 4.70/5.0 average rating across 131 reviews on its main product page with press coverage from Engadget, The Verge, Cult of Mac, and Mac Format.
SonarPen firmographics
Firmographics- Name
- SonarPen
- Legal name
- GreenBulb Trading Limited
- Website
- https://sonarpen.com
- Company type
- Private
- Founded year
- 2018
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- SonarPen, operated by Hong Kong-based GreenBulb Trading Limited, designs and sells battery-free pressure-sensitive smart styluses that use a host device's audio jack or USB-C port for pressure detection, serving digital artists, students, and casual users across iOS, Android, Windows, Mac, Chromebook, and Nintendo Switch.
- Ownership category
- akta.pro rank
SonarPen industry classification
Industry- Product category
- Consumer Electronics
- SIC
- Pens, Pencils & Other Artists' Materials (3950)
- akta.pro primary industry
- Graphics Tablets, Styluses & Pen Displays (HDACAFAD)
- akta.pro secondary industries
- Tablet Accessories (Keyboards, Styluses, Cases, Screen Protectors, Docks) (CRACAMAJ), Tablet/Ultrabook Accessories (Keyboards, Pens, Cases, Screen Protectors) (HDACAMAL)
Keywords
Where SonarPen is headquartered
LocationHeadquarters
- HQ city
- Kowloon City
- HQ country
- Hong Kong SAR China
- HQ region
- Asia
Offices1 record
Markets served
SonarPen business model
Business model- GTM type
- B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Marketing or Sales, Technology or R&D, Personnel, Infrastructure
Revenue model
- Hardware Sales - Stylus Pens: One-time hardware sales of SonarPen stylus products including original SonarPen ($39.50), SonarPen USB C ($41.00), and SonarPen 2 ($45.00). Revenue generated from direct consumer purchases.
- Accessories Sales: Sales of replacement nib sets, pen holders/pockets, adapters (Lightning, USB-C to 3.5mm), and bundled products. Prices range from $5.00 to $56.00 for various accessories and bundles.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Pay-as-you-go | SonarPen 2 - Battery-Free Pressure-Sensitive Stylus for iPad |
| One time/ perpetual license | Pay-as-you-go | SonarPen (USB C) - Universal pressure sensitive stylus |
| One time/ perpetual license | Pay-as-you-go | SonarPen Original - Most affordable pressure sensitive stylus |
| Unit Pricing | Pay-as-you-go | SonarPen 2 Replacement Nib Set |
| Unit Pricing | Pay-as-you-go | SonarPen USB Type-C to Type-A Adapter |
| Unit Pricing | Pay-as-you-go | SonarPen USB Type-C to 3.5mm Headphone Jack Adapter |
| Unit Pricing | Pay-as-you-go | SonarPen Lightning to 3.5mm Headphone Jack Adapter |
| Unit Pricing | Pay-as-you-go | SonarPen Pocket - Carrying Case |
| Unit Pricing | Pay-as-you-go | SonarPen + Nib Set Bundle (iOS) |
| Unit Pricing | Pay-as-you-go | SonarPen + Nib Set Bundle (Android) |
Go-to-market motion3 records
Distribution channels1 record
Marketing channels6 records
SonarPen product offering
Product offeringCore offering
SonarPen designs, manufactures, and sells battery-free, pressure-sensitive smart styli that turn iPad, iPhone, Android, Chromebook, Nintendo Switch, Windows, and Mac devices into professional digital drawing pads. The portfolio includes the original audio-jack SonarPen, the USB-C variant, and the latest SonarPen 2, complemented by replacement nibs, adapters, and a carrying case sold directly to consumers.
Product overview
SonarPen is a product portfolio of battery-free pressure-sensitive smart styli designed to transform compatible devices into professional digital drawing pads. The core offerings include SonarPen (original audio-jack version), SonarPen (USB C) for newer devices, and SonarPen 2 as the latest generation. The ecosystem extends through various adapters (Lightning, USB Type-C, USB C to A) enabling broad device compatibility across iPad, iPhone, Android, Nintendo Switch, Windows, Mac, and Chromebook. Supporting products include replacement nib sets (optimized for iOS or Android platforms), pen carriers (Pocket), and value bundles combining multiple products at discounts. The company sells direct-to-consumer through its online store.
Differentiator
Problem solved
Functional benefit
Brands
- SonarPen 2: Second generation pressure-sensitive stylus for iPad with improved design and smarter features, battery-free operation
- SonarPen (USB C)
- Colors SonarPen
Products and services
- SonarPen 2 Battery-free pressure-sensitive smart stylus for iPad, designed for digital artists and note-takers who want Apple Pencil-class performance at a lower price point.
- SonarPen (Original) Original audio-jack-based battery-free pressure-sensitive smart pen that turns compatible iPad, iPhone, Android, Nintendo Switch, Windows, and Mac devices into professional drawing pads, featuring palm/finger rejection and a customizable shortcut button.
- SonarPen (USB C) USB Type-C variant of the SonarPen for modern devices without a 3.5mm audio jack, providing plug-and-play pressure-sensitive drawing on newer iPads, Android, Windows, Mac, and Chromebook.
- SonarPen Replacement Nib Sets (iOS- and Android-optimized) Pack of three replacement nibs for the SonarPen family, available in iOS-optimized and Android/Windows/Mac/Nintendo Switch-optimized versions, designed to extend stylus life.
- SonarPen Pocket Durable tailor-fit carrying case for SonarPen-family styli, enabling users to transport the pen separately from their tablet or phone.
- SonarPen Lightning to 3.5mm Headphone Jack Adapter Adapter that connects the original audio-jack SonarPen to Apple devices with Lightning ports, expanding stylus compatibility across iPhone and iPad lineups.
- SonarPen USB Type-C to 3.5mm Headphone Jack Adapter Adapter that bridges the original audio-jack SonarPen to USB-C devices, preserving compatibility as the industry transitions away from 3.5mm jacks.
- SonarPen USB C to USB A Adapter Adapter that connects the SonarPen (USB C) stylus to older Windows and Mac computers with only a USB Type-A port, preserving compatibility with legacy desktops and laptops.
- SonarPen 2 to iPad Adapter Adapter that allows SonarPen 2 to connect to older iPads with Lightning ports, extending the new stylus's compatibility across the iPad lineup.
- SonarPen 2 Replacement Nib Set Three-pack replacement nibs for the SonarPen 2 stylus, engineered to last about a year under average use without scratching iPad screens.
Quantifiable outcome
- Durable silicon core designed to withstand 100,000 bends
- +1 more outcomes
Companies that use SonarPen
Customer profileNamed customers5 records
Segments4 records
Ideal customer profiles3 records
SonarPen technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration7 records
Feature5 records
SonarPen partnerships and signals
Strategic signalScale indicators5 records
Recent moves5 records
Expansion highlights5 records
SonarPen competitors and assessment
Company assessmentEmerging players
- Meko: Budget stylus manufacturer offering affordable alternatives for tablets and phones. Comparable low-price positioning and target market of cost-sensitive consumers seeking basic stylus functionality.
- Renaisser (Raphael): Active stylus brand targeting iPad users with pressure sensitivity at competitive price points. Directly comparable product category and target segment, with similar positioning against Apple Pencil.
Direct peers
- XP-Pen: Affordable drawing tablets and styluses targeting budget-conscious digital artists. Comparable in price-point and accessibility focus, though primarily focused on standalone drawing tablets rather than mobile-device styluses.
- Huion: Manufacturer of affordable drawing tablets and pen displays for digital artists. Competes in the same budget-conscious segment as SonarPen with comparable value proposition around accessibility and price.
- Adonit: Direct competitor producing pressure-sensitive styluses for iOS, Android, and Windows. Comparable product category, similar target market of digital artists and note-takers, and similar price-band positioning.
- Staedtler (Noris digital): Traditional pencil manufacturer with a digital stylus line for iPad. Comparable EMR/stylus technology for digital artists, targeting users transitioning from traditional drawing to digital.
- Logitech Crayon: Logitech's pressure-sensitive stylus designed primarily for iPad at a lower price point than Apple Pencil. Directly comparable product positioning, target audience (students, education), and value proposition.
Broad incumbents
- Apple (Apple Pencil): Maker of Apple Pencil, the dominant iPad stylus with deep system-level integration. Direct competitor in the pressure-sensitive stylus category but limited to Apple devices, contrasting with SonarPen's cross-platform approach.
- Wacom: Global leader in professional pen tablets and styluses for creative professionals. Overlaps with SonarPen in the digital drawing stylus category but focuses on premium dedicated tablets rather than mobile-device styluses.
- Samsung (S Pen): Integrated stylus for Samsung Galaxy devices and tablets. Comparable stylus category but with deep platform integration that SonarPen cannot replicate on Android devices.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
SonarPen social profiles
Digital presenceSonarPen financial estimates
Financial estimateRevenue estimate
Valuation estimate
SonarPen leadership team
Management profileNumber of profiles
Profiles1 record
SonarPen funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
SonarPen M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about SonarPen
What does SonarPen do?
SonarPen designs, manufactures, and sells battery-free, pressure-sensitive smart styli that turn iPad, iPhone, Android, Chromebook, Nintendo Switch, Windows, and Mac devices into professional digital drawing pads. The portfolio includes the original audio-jack SonarPen, the USB-C variant, and the latest SonarPen 2, complemented by replacement nibs, adapters, and a carrying case sold directly to consumers.
Is SonarPen a public or private company?
SonarPen is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was SonarPen founded?
SonarPen was founded in 2018. It employs 11 to 50 people.
Where is SonarPen based?
SonarPen is headquartered in Kowloon City, Hong Kong SAR China, in the Asia region.
How does SonarPen make money?
Two revenue lines are on record. Hardware Sales - Stylus Pens are the primary driver. The others are accessories Sales.
Who are SonarPen's main competitors?
Emerging players on record are Meko and Renaisser (Raphael). Direct peers are XP-Pen, Huion, Adonit, Staedtler (Noris digital) and Logitech Crayon. Broad incumbents are Apple (Apple Pencil), Wacom and Samsung (S Pen).
Does SonarPen have an API?
No public API is recorded for SonarPen.
What industry is SonarPen in?
SonarPen's product category is Consumer Electronics. Its primary akta.pro industry code is HDACAFAD, Graphics Tablets, Styluses & Pen Displays, with a secondary code of CRACAMAJ, Tablet Accessories (Keyboards, Styluses, Cases, Screen Protectors, Docks). Its SIC code is 3950.