CallataGuidesBusiness phone system for custom computer programming services firms in Charleston, SC
Custom computer programming services firms in the Charleston-North Charleston, SC metro area: 121 establishments in 2023, the local area codes, and what phone service costs a 19-person team.
- Establishments
- 121CBP 2023
- Employees
- 2,350mid-March 2023
- Per 100k residents
- 13.9U.S. 20.0
- Rank
- 74th of 563areas by count
Custom computer programming services firms in Charleston, SC by the numbers
The Census Bureau's 2023 County Business Patterns lists 121 establishments classified as Custom Computer Programming Services (NAICS 541511) in the Charleston-North Charleston, SC metro area. Together they reported 2,350 mid-March employees and $293.8 million of payroll for the year. That ranks 74th of the 563 metro and micropolitan areas where Census published a count for this industry.
With 870,000 residents in the Census 2024 estimate, that is 13.9 custom computer programming services firms per 100,000 people, 30.5% below the national rate of 20.0. Establishments average 19.4 employees, 30.6% above the U.S. average of 14.9. Payroll per employee comes to $125,004, in line with the national $124,254.
| Measure | Charleston, SC | South Carolina | United States |
|---|---|---|---|
| Establishments | 121 | 566 | 68,051 |
| Mid-March employees | 2,350 (moderate noise) | 6,066 | 1,012,250 |
| Annual payroll | $293,759,000 | $640,989,000 | $125,775,835,000 |
| Employees per establishment | 19.4 | 10.7 | 14.9 |
| Payroll per employee | $125,004 | $105,669 | $124,254 |
| Establishments per 100,000 residents | 13.9 | 10.3 | 20.0 |
Census County Business Patterns 2023 (mid-March employment; annual payroll). Employees and payroll flagged high-noise are shown but not used in the text. Residents: Census Vintage 2024 estimates.
Team sizes at custom computer programming services firms in Charleston, SC
Of the custom computer programming services firms in Charleston, SC that had employees in March 2023, 62.4% had fewer than five (the U.S. share is 72.0%). 75.2% had fewer than ten. When a business has only a few people, whoever is free answers the phone, and calls that arrive while everyone is busy go to voicemail unless they are routed somewhere else.
| Employment size | Establishments | Share | U.S. share |
|---|---|---|---|
| 1–4 employees | 73 | 62.4% | 72.0% |
| 5–9 employees | 15 | 12.8% | 10.1% |
| 10–19 employees | 12 | 10.3% | 7.0% |
| 20–49 employees | 13 | 11.1% | 5.9% |
| 50 or more employees | 4 | 3.4% | 4.9% |
Employment-size classes count establishments by mid-March 2023 employment. Establishments with no March employees are excluded from the size classes, so shares are of establishments with employees. Source: Census County Business Patterns 2023.
Why the phone matters for custom computer programming services firms in Charleston, SC
Small software shops juggle client meetings, support requests and sales calls with a team that is mostly heads-down building. A shared line with routing keeps support from interrupting developers while still answering clients.
A few of the calls that come in to custom computer programming services firms in Charleston, SC:
- A prospect calls to discuss a new app project.
- A partner agency calls about a subcontract.
- A client calls to schedule a demo.
When nobody can pick up
Production issues can come in after hours, so an urgent flag on voicemail helps the on-call developer.
With business-hours routing, calls after closing can go to transcribed voicemail or an optional AI receptionist instead of ringing an empty room.
What a phone system costs a custom software firm in Charleston, SC
The average custom software firm in Charleston, SC has 19.4 employees, so a 19-person team is a reasonable benchmark. Priced per seat, 19 users would run $570.00 a month on RingCentral RingEX Core and $474.05 on Ooma Office Pro (month-to-month list prices, checked September 28, 2026). On Callata the same 19 people cost $379.00 a month, less than either per-seat plan.
The annual difference against RingCentral's monthly list price comes to $2,292. Some vendors discount annual contracts; the table shows month-to-month prices.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $379.00 | $4,548.00 |
| Quo (Starter) | $19.00 per user | $361.00 | $4,332.00 |
| Nextiva (Core) | $23.00 per user | $437.00 | $5,244.00 |
| Ooma (Office Pro) | $24.95 per user | $474.05 | $5,688.60 |
| Dialpad (Standard) | $27.00 per user | $513.00 | $6,156.00 |
| RingCentral (RingEX Core) | $30.00 per user | $570.00 | $6,840.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Which area code to use in Charleston, SC
NANPA records place the exchanges of the area's named cities and towns in 2 area codes. 843 has the most, with 267 of 330 exchanges (81%). Callata's plan includes up to 3 local numbers; you can pick them in the area codes your clients recognize, subject to carrier inventory, or port the number you already have for free.
| Area code | Exchanges | Time zone | In service since | Overlay with |
|---|---|---|---|---|
| 843 | 267 | Eastern | 1998 | 854 |
| 854 | 63 | Eastern | 2015 | 843 |
Exchanges are NANPA-assigned central office codes (NPA-NXX) in the rate centers matched to the area's named places. Source: NANPA utilized code and NPA reports.
What custom computer programming services firms in Charleston, SC get with Callata
Callata is a business phone system priced at $99 a month with 5 users included, then $20 per additional user. Callata Office includes up to 3 local business numbers, unlimited inbound calling, 1,500 pooled outbound US and Canada minutes per user each month, a browser softphone that can also ring your cell, voicemail with transcription, call recording with AI summaries, business-hours routing and E911 on every number.
If you already have a number in Charleston, SC, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
Frequently asked questions
How many custom computer programming services firms are there in Charleston, SC?
Census County Business Patterns counted 121 custom computer programming services firms in the Charleston-North Charleston, SC metro area in 2023. They employed 2,350 people in mid-March.
What does a business phone system cost for a 19-person custom software firm?
At month-to-month list prices checked September 28, 2026, 19 users cost $570.00 a month on RingCentral RingEX Core and $474.05 on Ooma Office Pro. On Callata, $99 a month with 5 users included, then $20 per additional user, the same team pays $379.00.
What area code should a custom software firm in Charleston, SC use?
Area code 843 has the most assigned exchanges among the area's named places, followed by 854. If you already have a local number, you can port it to Callata for free.
Can an AI receptionist answer calls for a custom software firm?
Yes. Callata's optional AI agents can answer when the team is busy or closed, take a message, text, email or transfer the call. They disclose that they are AI and are billed from prepaid AI minutes at $0.25 per minute.