Caster Biz
Caster Biz (株式会社キャスター), founded in 2014, operates Japan's first online remote-assistant platform, combining AI with a distributed pool of 800+ human assistants to deliver secretarial, administrative, HR, and accounting support to 6,000+ Japanese companies ranging from startups to large enterprises such as Mercari and Mitsui Fudosan.
- Company typePrivate
- Founded2014
- HeadquartersTokyo, Japan
- Headcount1–10
- GTM typeB2B
- OfferingServices
What Caster Biz does
Caster Biz (株式会社キャスター) is a Japanese remote-assistant and business process outsourcing platform founded in 2014 and headquartered in Saito, Miyazaki Prefecture, with commercial operations centered in Tokyo. The company's flagship service, CASTER BIZ assistant, delivers online secretarial, administrative, HR, accounting-support, translation, and creative tasks by combining what the company describes as AI technology with a distributed pool of 800+ remote assistants (employees and dispatch staff combined, as of April 2023). The platform targets a horizontal customer base spanning early-stage startups through large enterprises, including named users such as Mercari, Mitsui Fudosan, LIXIL, Wingarc 1st, BASE FOOD, Piara, Willgate, and UZABASE, with cumulative contracted accounts reported at 6,000+ companies as of November 2025.
The core product is delivered entirely online, with assistants plugging into client environments via integrations with Slack, Chatwork, Salesforce, kintone, HRMOS, SmartHR, Google Forms, and video conferencing tools. Service is sold on a recurring monthly subscription (BASIC plan: 30 hours/month at ¥120,000 on a 12-month contract or ¥132,000 on a 6-month contract, exclusive of tax), with custom plans for higher volumes. Around the assistant core, Caster has built an ecosystem of sub-brands: CASTER BIZ Visit (offline/onsite tasks), CASTER BIZ Recruiting (採用), CASTER BIZ HR (労務), CASTER BIZ accounting (経理BPaaS targeting listed companies, launched September 2025), and MyAssistant (flexible spot assistance). Distribution is sales-led (phone, online inquiry, free seminars) supplemented by an Introduction and Sales Partner program. The company is privately held and bootstrapped for growth, with only ~$3.7M of disclosed funding across a 2014 Incubate Fund seed and a 2019 round led by Gunosy Capital and SMBC Venture Capital.
Caster Biz firmographics
Firmographics- Name
- Caster Biz
- Legal name
- 株式会社キャスター
- Website
- https://cast-er.com
- Company type
- Private
- Founded year
- 2014
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- Caster Biz (株式会社キャスター), founded in 2014, operates Japan's first online remote-assistant platform, combining AI with a distributed pool of 800+ human assistants to deliver secretarial, administrative, HR, and accounting support to 6,000+ Japanese companies ranging from startups to large enterprises such as Mercari and Mitsui Fudosan.
- Ownership category
- akta.pro rank
Caster Biz industry classification
Industry- Product category
- Remote Assistant Services / Business Process Outsourcing
- NAICS
- Other Scientific and Technical Consulting Services (54169)
- SIC
- Services-Engineering, Accounting, Research, Management (8700)
- akta.pro primary industry
- Business Intelligence, Reporting & Visualization Services (BPAEAHAD)
Keywords
Where Caster Biz is headquartered
LocationHeadquarters
- HQ city
- Tokyo
- HQ country
- Japan
- HQ region
- Asia
Offices1 record
Markets served
Caster Biz business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Monthly Subscription - BASIC Plan: Core subscription service providing 30 hours of remote assistant support per month. Available in 6-month or 12-month contracts. Payment is monthly via bank transfer (advance payment required). Minimum commitment starts at 30 hours/month.
- Custom Plan: Tailored service plans created according to specific client requirements and usage needs
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | BASIC Plan - 30 hours/month |
Go-to-market motion2 records
Distribution channels2 records
Marketing channels5 records
Caster Biz product offering
Product offeringCore offering
Caster Biz provides an online remote assistant service that combines AI technology with skilled human remote assistants (the '1/100 Talent' model) to handle secretarial, administrative, HR, accounting, translation, and creative tasks for client companies. Services are delivered entirely online with monthly subscription plans starting at 30 hours/month, supported by related offerings including CASTER BIZ accounting (BPaaS for listed companies) and CASTER BIZ Visit (offline/on-site assistance).
Product overview
CASTER BIZ is a remote assistant service platform combining AI and human talent. The core offering is the CASTER BIZ assistant service, which provides online remote assistants for secretarial, administrative, HR, accounting, translation, and creative tasks. Related products include CASTER BIZ accounting (specialized accounting BPaaS for listed companies) and CASTER BIZ Visit (offline/visit-based assistant for physical tasks). The platform also includes MyAssistant for flexible spot assistance. All services can be accessed via a button-click request system with quick service initiation.
Differentiator
Problem solved
Functional benefit
Brands
- CASTER BIZ assistant: Remote assistant service combining AI and human assistants for business task outsourcing.
- CASTER BIZ Visit
- CASTER BIZ accounting (経理BPaaS)
- CASTER BIZ Recruiting (採用)
- CASTER BIZ HR (労務)
Products and services
- CASTER BIZ assistant Core online remote assistant service combining AI and human talent to handle secretarial tasks (appointment scheduling, email handling, travel arrangements), administrative work (data entry, invoicing, sales material preparation), HR tasks (job posting, candidate communication, attendance tracking), accounting support (bookkeeping, invoice processing), translation, and creative/design tasks. Minimum 30 hours/month starting point.
- CASTER BIZ accounting Accounting BPaaS specialized for listed companies. Offers month-end closing acceleration, accounts payable/receivable management, invoice processing, and operational systematization aimed at achieving zero dedicated accounting staff.
- CASTER BIZ Visit Offline/onsite assistant service that complements the online CASTER BIZ assistant. Handles physical tasks including filing, business card scanning, document organization, and paper processing for clients needing in-person support.
- MyAssistant Flexible remote assistant service with spot assistants available. Allows clients to choose assistants based on their schedule flexibility needs, including early morning to late night availability.
Quantifiable outcome
- Monthly closing time reduced from 8-9 days to 4-5 days for some clients
- +3 more outcomes
Companies that use Caster Biz
Customer profileNamed customers13 records
Segments3 records
Ideal customer profiles3 records
Caster Biz technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration10 records
AI capability2 records
Feature2 records
Caster Biz partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered minor.
- Introduction Partners (紹介パートナー)minorMutual referral partnership where partners introduce CASTER BIZ to their clients and receive introductions to CASTER BIZ's client base in return. No fees charged for participation. Designed for companies seeking cross-promotion opportunities.
- Sales Partners (販売パートナー)minorReferral partners who introduce CASTER BIZ services and receive contracted referral fees. Partners identify companies with alignment and introduce directly. Focus on organic referrals from partners who find CASTER BIZ suitable for their client needs.
Scale indicators3 records
Recent moves6 records
Expansion highlights5 records
Caster Biz competitors and assessment
Company assessmentBroad incumbents
- Recruit Holdings: Japanese HR/media conglomerate operating Indeed, Airレジ, and large BPO operations — broad incumbent whose AI-enabled services could compete with Caster's SMB assistant positioning.
- Persol Holdings: Major Japanese HR services and staffing conglomerate (Tempstaff, doda) with growing BPO and digital transformation offerings — represents the large incumbent alternative for enterprise back-office outsourcing decisions.
- Outsourcing Inc. One of Japan's largest staffing and BPO groups with broad offerings across engineering, manufacturing, and back-office outsourcing — overlaps with Caster's accounting/HR sub-brands as a broader incumbent in adjacent segments.
- Will Group Inc. Japanese staffing and BPO group operating across sales support, call center, and back-office segments — comparable as an established BPO incumbent but with a different go-to-market (staffing-led rather than subscription-assistant-led).
Direct peers
- FOC Inc. Japanese BPO provider focused on accounting, HR, and secretarial outsourcing for SMBs — competes in the same online back-office outsourcing category, often bundled with similar subscription-style engagement models.
- in-house Inc. Japan-based online secretary / assistant service targeting small businesses and startups, offering hourly plans for administrative and secretarial work — directly comparable offering to CASTER BIZ assistant.
- Anchor Inc. Operates an online assistant service (Online Assistant) in Japan targeting SMB back-office tasks including secretarial, accounting, and HR support — comparable subscription model and customer segment to Caster Biz.
- BACKS Inc. Japanese online assistant / virtual secretary service provider offering subscription-based remote administrative support to SMBs and startups — closest direct competitor to Caster Biz in the Japan online-assistant category.
Emerging players
- BizteX Inc. Japanese RPA / process automation vendor (BizRobo) increasingly bundling AI + human BPO services — competes with Caster's automation narrative and is building the same hybrid AI-plus-human value proposition.
- Timee Inc. Operates a Japan-based flexible work/gig platform connecting businesses with on-demand workers for short-hour tasks — adjacent model that could overlap with Caster's spot-assistant MyAssistant offering for flexible, low-commitment task work.
Market position
Weaknesses5 records
Competitive moat4 records
Key risks7 records
Key highlights8 records
Customer concentration
Caster Biz social profiles
Digital presenceCaster Biz compliance and trust
Trust signalCompliance2 records
Caster Biz financial estimates
Financial estimateRevenue estimate
Valuation estimate
Caster Biz leadership team
Management profileNumber of profiles
Profiles2 records
Caster Biz subsidiaries and ownership
Company hierarchySubsidiaries3 records
Caster Biz funding detail
Funding detailFunding overview
Funding rounds2 records
Investors3 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Caster Biz 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 Caster Biz
What does Caster Biz do?
Caster Biz provides an online remote assistant service that combines AI technology with skilled human remote assistants (the '1/100 Talent' model) to handle secretarial, administrative, HR, accounting, translation, and creative tasks for client companies. Services are delivered entirely online with monthly subscription plans starting at 30 hours/month, supported by related offerings including CASTER BIZ accounting (BPaaS for listed companies) and CASTER BIZ Visit (offline/on-site assistance).
Is Caster Biz a public or private company?
Caster Biz is a private company. It is classified as venture growth investor backed and is currently operating.
When was Caster Biz founded?
Caster Biz was founded in 2014. It employs 1 to 10 people.
Where is Caster Biz based?
Caster Biz is headquartered in Tokyo, Japan, in the Asia region.
How does Caster Biz make money?
Two revenue lines are on record. Monthly Subscription - BASIC Plan is the primary driver. The others are custom Plan.
Who are Caster Biz's main competitors?
Broad incumbents on record are Recruit Holdings, Persol Holdings, Outsourcing Inc. and Will Group Inc.. Direct peers are FOC Inc., in-house Inc., Anchor Inc. and BACKS Inc.. Emerging players are BizteX Inc. and Timee Inc..
Does Caster Biz have an API?
No public API is recorded for Caster Biz.
What industry is Caster Biz in?
Caster Biz's product category is Remote Assistant Services / Business Process Outsourcing. Its primary akta.pro industry code is BPAEAHAD, Business Intelligence, Reporting & Visualization Services. Its NAICS code is 54169 and its SIC code is 8700.